GMAT Problem Solving Discussions

1. each increment of 10 -> 10 times the value
In (125,165) there are 4 increments of 10. Hence, 165 on this scale is (4*10)*10=400 times 125.

2. Leak rate -> 1 cup/hr
No. of hrs travelld -> 2
No. of cups leakd -> 2*1=2cups
Hence, the no. of cups dat cud hav been used -> 10-2=8
But, 1 cup was left over at the end of the hike. Hence, no. of cups actually used -> 8-1=7
Of these 7 cups, 3 were consumed in the last mile. Hence, remainin 7-3=4 cups wer used in the first 5 miles.

1. each increment of 10 -> 10 times the value
In (125,165) there are 4 increments of 10. Hence, 165 on this scale is (4*10)*10=400 times 125.

2. Leak rate -> 1 cup/hr
No. of hrs travelld -> 2
No. of cups leakd -> 2*1=2cups
Hence, the no. of cups dat cud hav been used -> 10-2=8
But, 1 cup was left over at the end of the hike. Hence, no. of cups actually used -> 8-1=7
Of these 7 cups, 3 were consumed in the last mile. Hence, remainin 7-3=4 cups wer used in the first 5 miles.

Q2) Water leaks @ 1l/hr => At t = 1, 1 l leaks out and at t=2, another 1 l leaks out.
Total water leaked at the end of 2 hrs = 2.
Harry drinks 3 l in last 1 mile
Hence water used up by Harry in first 5 miles = 9-2-3 = 4
Avg l/mile = 4/5

q1) This is a ques from OG and frankly speaking, i cud not understand the solution. still trying to figure out a solution from my physics book (measurements chapter)

thanks

DS

Is the positive integer r an even number?

(1) r is a prime number
(2) 3
PS

If a is the average (arithmetic mean) of 6 consecutive odd integers, which of the following must be true?

(I) a is a multiple of 6
(II)a is a non-zero integer
(III)a is an even integer

(A) I Only
(B) III Only
(C) I and III only
(D) II and III only.
(E) I , II and IIIS

DS

Is the positive integer r an even number?

(1) r is a prime number
(2) 3 26

PS

If a is the average (arithmetic mean) of 6 consecutive odd integers, which of the following must be true?

(I) a is a multiple of 6
(II)a is a non-zero integer
(III)a is an even integer

(A) I Only
(B) III Only
(C) I and III only
(D) II and III only.
(E) I , II and IIIS



I wud reckon the 2nd one is D
whtz de OA?
Q2) Water leaks @ 1l/hr => At t = 1, 1 l leaks out and at t=2, another 1 l leaks out.
Total water leaked at the end of 2 hrs = 2.
Harry drinks 3 l in last 1 mile
Hence water used up by Harry in first 5 miles = 9-2-3 = 4
Avg l/mile = 4/5

q1) This is a ques from OG and frankly speaking, i cud not understand the solution. still trying to figure out a solution from my physics book (measurements chapter)

thanks



I had a similar prob fig out these intensity probs
here is how u can approach it:
in 125 number of 10's is 12 so it can be read as 12500
165 can be read as 16500
difference is 400
I wud reckon the 2nd one is D
whtz de OA?




Yes, the OA for the second one is D.
Please Explain! :)
DS

Is the positive integer r an even number?

(1) r is a prime number
(2) 3 26

PS

If a is the average (arithmetic mean) of 6 consecutive odd integers, which of the following must be true?

(I) a is a multiple of 6
(II)a is a non-zero integer
(III)a is an even integer

(A) I Only
(B) III Only
(C) I and III only
(D) II and III only.
(E) I , II and IIIS


q1) B
q2) let first odd no. be x
hence sum of first 6 odd nos, = 6x+30 = 6a
hence a = x+5
As x is odd, x+5 is always even.
For x = -5(an odd no), a becomes zero.

i am nt able to digest he D can be the OA can be D
For me its B.

thanks
q1) B
q2) let first odd no. be x
hence sum of first 6 odd nos, = 6x+30 = 6a
hence a = x+5
As x is odd, x+5 is always even.
For x = -5(an odd no), a becomes zero.

i am nt able to digest he D can be the OA can be D
For me its B.

thanks


Yes the OA for the Q1 is B, you are correct!
Actually i am also not able to digest OA for Q2.
I dont know , whether i am doing some basic mistake or not...?
Isn't -5 , -3, -1, 1, 3, 5 a consequitive odd series?
The sum can be zero and thereby the avg is also zero.
The only correct option which i feel is the third one.


Moreover, can you please explain the Q1.
Because i feel it should be C ( Both Together ) , since the question asks is positive integer r an even number...?
How can you say it is from 3It can be even or odd ....???
Makes sense? I dont know ... i think i am going crazy as my exams are coming closer ....thanks for your input Srikanth267!!

Yes the OA for the Q1 is B, you are correct!
Actually i am also not able to digest OA for Q2.
I dont know , whether i am doing some basic mistake or not...?
Isn't -5 , -3, -1, 1, 3, 5 a consequitive odd series?
The sum can be zero and thereby the avg is also zero.
The only correct option which i feel is the third one.


Moreover, can you please explain the Q1.
Because i feel it should be C ( Both Together ) , since the question asks is positive integer r an even number...?
How can you say it is from 3 26....?
It can be even or odd ....???
Makes sense? I dont know ... i think i am going crazy as my exams are coming closer ....thanks for your input Srikanth267!!

Coming to ur query on q1

Stem 1: r is a prime no. (can be any no n need not necessarily be 2) hence not suff
Stem 2: Its 3Anyways, in this range, there is no prime no which is even (BTW 2 is the only even prime no in number system)

Hence B is suff to answer the ques.

But q2) I'll go with B, can't think of any other way.

thanks
Coming to ur query on q1

Stem 1: r is a prime no. (can be any no n need not necessarily be 2) hence not suff
Stem 2: Its 3Anyways, in this range, there is no prime no which is even (BTW 2 is the only even prime no in number system)

Hence B is suff to answer the ques.

But q2) I'll go with B, can't think of any other way.

thanks



Thanks, Srikanth.... Yes i typed the inequality incorrectly ...sincere apologies for that!
But I am still unable to understand the logic behind the Q1 's answer being B !! The Prime No. part is mentioned only in Stem 1. So if we look at the stem 2 , ie, 3

A man can hit a target once in 4 shots. If he fires 4 shots in succession, what is the probability that he will hit his target?

A. 1
B.
C.
D.
E.

Yes, 3 is the correct answer.

alchemist-mba Says
A.M = (3+k+2+8+m+3) / 6 = 4 => m+k = 8.... (m,k) = (1,7)(2,6)(3,5) or (7,1)(6,2)(5,3) --> in all cases median is '3'.

Oa
1. 400
2.4/5

1.on a certain scale of intensity, each increment of 10 in magnitude represents a tenfold increase in intensity. On this scale an intensity corresponding to a magnitude of 165 is how many times an intensity corresponding to a magnitude of 125?

2.
harry started a 6-mile hike with a full 10-cup canteen of water and finished the hike in 2 hours with 1 cup of water remaining in the canteen. If the canteen leaked at the rate of 1 cup per hour and harry drank 3 cups of water during the last mile, how many cups did he drink per mile during the first 5 miles of the hike?


If the selling price of 2 articles are equal and 1 of them is sold at a profit of p% and the other at a loss of p%, then the 2 trades will result in a cumulative loss of ((p^2)/100)%.
A cylinder holds 10 liters of water. All of the water is poured into a cube, 50 cm on a side. What is the depth of the water (1 liter equals 1000 cubic cm of water)?

A) 4cm

B) 10cm

C) 40cm

D) 60cm

E) 100cm

Alchemist-MBA where are you My Friend??
Need your inputs on my previous questions!

And here is another DS!!

If X+Y = 20, and X U+V

1. Y+U+V = 30
2. U+V
Please Help!!

Alchemist-MBA where are you My Friend??
Need your inputs on my previous questions!

And here is another DS!!

If X+Y = 20, and X U+V

1. Y+U+V = 30
2. U+V
Please Help!!


The answer should be D. whats the OA?
A cylinder holds 10 liters of water. All of the water is poured into a cube, 50 cm on a side. What is the depth of the water (1 liter equals 1000 cubic cm of water)?

A) 4cm

B) 10cm

C) 40cm

D) 60cm

E) 100cm

A. 4 cm ?
Whats the OA?
Calendar Says
The answer should be D. whats the OA?



The Answer given in Pearson's GMAT Prep (LPE) Test 1
is B ( Statement 2 Alone ....)
However, even for me the answer is D.
Coz the max value you can give X is 9 and then Y becomes 11,
which makes U+V = 19 which is lower than 20.
Y cant be negative , since its the greater one and if you assume X to be negative it will increase Y's value and thus reduce the U+V 's value.
Tell me if you are with me?
( At last i am not the only one!!)
A. 4 cm ?
Whats the OA?

Has to be 4 cm.

thanks