Another one where I need a confirmation ;)
If n + 5 = 5, what is the value of n?
1. n^2is not equal to 0
2. n^2+ 10n = 0
If n + 5 = 5, what is the value of n? 
n+5 = 5, then n=0
1. n^2is not equal to 0
2. n^2+ 10n = 0
n+5 = 5, then n=0 1. n^2is not equal to 0
2. n^2+ 10n = 0
A jar contains 8 red marbles and y white marbles. If Joan takes 2 random marbles from the jar, is it more likely that she will have 2 red marbles than that she will have one marble of each color?
(1) y 8
(2) y 4
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other's point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
the question is straight forward.. but the OA is confusing.. :S
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other's point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
the question is straight forward.. but the OA is confusing.. :S
i think its E(none of the options are sufficient), since we are not sure of P and Q's speed from either of the statement
tuls18 Saysi think its E(none of the options are sufficient), since we are not sure of P and Q's speed from either of the statement
notice closely thw ques tells u about the avg speed for one of the trains till it meets the other.. 😉
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the others point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
the question is straight forward.. but the OA is confusing.. :S
IMO: A
1. At the time the trains passed, Train P "Had Averaged"...so from 0 to 2hrs cumulatively, train P travelled 70mph, so in 2 hrs it covered 140 miles. So it is surely closer to its destination. SUFF
2. Q's total avg speed is given, but we dont know what its avg speed was, up until they met, i.e., for the first 2 hrs. So NOT SUFF
It surely is dicey ! Average Speed vs Constant Speed distance computation....
OA Please.
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the others point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
the question is straight forward.. but the OA is confusing.. :S
The answer is A.
from the question itself, we can find out the total average speed=250/2=125
statement1.P speed till two trains meet is 70 , so the Q speed will be=125-70=55
So train with a greater speed will be nearer i:e P
statemnt2.We cant say anythng abt bcoz we dont know the speed till two trains meet.
So Answer has to be
A
A jar contains 8 red marbles and y white marbles. If Joan takes 2 random marbles from the jar, is it more likely that she will have 2 red marbles than that she will have one marble of each color?
(1) y 8
(2) y 4
Pr of selecting two red marbles=8C2/(8+y)C2=P1
Pr of selecting one marble of each color=8*y/(8+y)(7+y)=P2
LET SAY P1>P2
SUBTRACTING THE TWO EXPRESSIONS WILL RESULT INTO -
8*(7-Y)/((8+Y)(7+Y)
THE NUMBER WILL BE POSITIVE FOR VALUES OF Y LESS THAN 7.
SO E.
IMO: A
1. At the time the trains passed, Train P "Had Averaged"...so from 0 to 2hrs cumulatively, train P travelled 70mph, so in 2 hrs it covered 140 miles. So it is surely closer to its destination. SUFF
2. Q's total avg speed is given, but we dont know what its avg speed was, up until they met, i.e., for the first 2 hrs. So NOT SUFF
It surely is dicey ! Average Speed vs Constant Speed distance computation....
OA Please.
for option 2-
Can't we say that the train covered 250 miles at 55mph av speed.average time taken is 250/55=50/11 hrs
Now now in 50/11 hrs--net distance covered is 250 miles
In 2hrs net distance covered will be 250*11/50*2=110 miles
*though the speed is not constant,it is just an av. speed.
Puys pls clarify the flaw, if any.
:banghead: 
for option 2-
can't we say that the train covered 250 miles at 55mph av speed.average time taken is 250/55=50/11 hrs
now now in 50/11 hrs--net distance covered is 250 miles
in 2hrs net distance covered will be 250*11/50*2=110 miles
*though the speed is not constant,it is just an av. Speed.
Puys pls clarify the flaw, if any.
see average means the first two hours can be travelled at slower and after that faster speed.so at the time of meet no affirmative conclusion can be stated
guy with guts Sayssee average means the first two hours can be travelled at slower and after that faster speed.so at the time of meet no affirmative conclusion can be stated
Hmm. yeahh...
Option A will suffice in this case only.
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the others point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
the question is straight forward.. but the OA is confusing.. :S
My take for the above DS is option E.Both statements are insuff to ans the q
@guy with guts
I like your conviction, "So Answer has to be A".. but unfortunately.. thats the wrong answer..
infact if you would notice option 2 closely (Train Q averaged a speed of 55 miles per hour for the entire trip) you would see that the speed of train Q remains constant througout the trip.. so you know the distance covered by Q each hour..
so in 2 hours Q would cover 55x2 = 110
in 2 hours Q meets P, so P has covered 250-110=140
so u know clearly that P is closer to its final destination..
option 2 is suff
coming back to option 1, "At the time when the two trains passed, train P had averaged a speed of 70 miles per hour." This means that train P has covered 70x2=140 at th etime it met train Q
thus Q must have travelled 250-140=110
so again u know that P is closer to its final destination..
option 1 is suff
the answer must be option D
hope that helps!! ;)
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the others point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
the question is straight forward.. but the OA is confusing.. :S
The answer is A.
from the question itself, we can find out the total average speed=250/2=125
statement1.P speed till two trains meet is 70 , so the Q speed will be=125-70=55
So train with a greater speed will be nearer i:e P
statemnt2.We cant say anythng abt bcoz we dont know the speed till two trains meet.
So Answer has to be
A
BTW the OA is option C,which I believe is absolutely wrong... until some puy can prove otherwise.. 
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the others point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
the question is straight forward.. but the OA is confusing.. :S
@guy with guts
I like your conviction, "So Answer has to be A".. but unfortunately.. thats the wrong answer..
infact if you would notice option 2 closely (Train Q averaged a speed of 55 miles per hour for the entire trip) you would see that the speed of train Q remains constant througout the trip.. so you know the distance covered by Q each hour..
so in 2 hours Q would cover 55x2 = 110
in 2 hours Q meets P, so P has covered 250-110=140
so u know clearly that P is closer to its final destination..
option 2 is suff
coming back to option 1, "At the time when the two trains passed, train P had averaged a speed of 70 miles per hour." This means that train P has covered 70x2=140 at th etime it met train Q
thus Q must have travelled 250-140=110
so again u know that P is closer to its final destination..
option 1 is suff
the answer must be option D
hope that helps!! ;)
Another one where I need a confirmation ;)
If n + 5 = 5, what is the value of n?
1. n^2is not equal to 0
2. n^2+ 10n = 0
Hey Varun,
Plz provide OA for this.. i guess there is a typo in the ques...
REPOST
If n + 5 = 5, what is the value of n?
1. n^2is not equal to 0
2. n^2+ 10n = 0
If n + 5 = 5, what is the value of n?
1. n^2is not equal to 0
2. n^2+ 10n = 0
REPOST
If n + 5 = 5, what is the value of n?
1. n^2is not equal to 0
2. n^2+ 10n = 0
IMO A
from the info in q stem we have
n=-10 or n=0 so
1) n!=0 so this is suff n=-10.
2) n=0 or n =-10. so both satisfy the equation. so insuff
post the OA plzz
If n + 5| = 5, what is the value of n?
n+5 =5 or n+5=-5
n =0 or n = -10
1. n^2is not equal to 0
then n = -10 suff
2. n^2+ 10n = 0
n* (n+10) =0
n =0 or n=-10 : insuff !!
Ans : A
correct me if i am wrong !!!
n+5 =5 or n+5=-5
n =0 or n = -10
1. n^2is not equal to 0
then n = -10 suff
2. n^2+ 10n = 0
n* (n+10) =0
n =0 or n=-10 : insuff !!
Ans : A
correct me if i am wrong !!!
You both got it right.. though you are far away from OA, but I am convinced this is right answer
I got this wrong.. I opted for option D, but forgot to notice that n=0 along with n=-10 in option 2.. :(
thanks buddies.. ;)
REPOST
If n + 5 = 5, what is the value of n?
1. n^2is not equal to 0
2. n^2+ 10n = 0
IMO A
from the info in q stem we have
n=-10 or n=0 so
1) n!=0 so this is suff n=-10.
2) n=0 or n =-10. so both satisfy the equation. so insuff
post the OA plzz
If n + 5| = 5, what is the value of n?
n+5 =5 or n+5=-5
n =0 or n = -10
1. n^2is not equal to 0
then n = -10 suff
2.
n^2+ 10n = 0
n* (n+10) =0
n =0 or n=-10 : insuff !!
Ans : A
correct me if i am wrong !!! :biggrin: