Thanks for solving this puzzle, yes my answer too is C. However, the Pearsons GMAT prep ( low priced edition) says B which i completely disagree. Jishnu
Hi Jishu, thought of clearing your confusion. Answer is indeed B.
Is the positive integer r an even prime number?
(1) r is a prime number (2) 3 In this question, with the FS 1, it says r is a prime no. There are many prime nos and only 1 is even among all. i.e 2. So the FS1 is does not justify it. i.e when you say, 2, it is an even prime no. Justifies. When you say, 3, it is an odd prime no. Does not Justify. Here the answer becomes inconsistent. i.e first we get Yes for even for 1 prime and No for odd for other primes. Hence info is inconsistent. That eliminates A & D.
FS2 says, 3 Take 5, it is odd prime no and it's not even. Take 7, it is odd prime no and not even. Take 11, odd and not even. . . . . .Take 23, odd and not even.
Here we are getting all the answers as NO. So the data is sufficient. Hence the answer is B and not C.
Common Bro...The statement in B just tells u that 3 We need to prove whether r is an even number....
we have even numbers from 4 to 24 that can be r......
So B cant be the answer.............
From A we just know that r is a prime number....
If you consider A ..then r can be 2,3 or any prime number....
A doesnt help because r can be 2 or any other prime number....So we cant judge r by only A ....
If you consider A & B..
we know that r is a even prime that is in between 3 & 26....Hence we know that answer for " Is the positive integer r an even number? " as NO...
I typed it fast ....I hope it helps..
regards Madhav
Hi Madhav, thought of clearing your confusion. Answer is indeed B.
Is the positive integer r an even prime number?
(1) r is a prime number (2) 3 In this question, with the FS 1, it says r is a prime no. There are many prime nos and only 1 is even among all. i.e 2. So the FS1 is does not justify it. i.e when you say, 2, it is an even prime no. Justifies. When you say, 3, it is an odd prime no. Does not Justify. Here the answer becomes inconsistent. i.e first we get Yes for even for 1 prime and No for odd for other primes. Hence info is inconsistent. That eliminates A & D.
FS2 says, 3 Take 5, it is odd prime no and it's not even. Take 7, it is odd prime no and not even. Take 11, odd and not even. . . . . .Take 23, odd and not even.
Here we are getting all the answers as NO. So the data is sufficient. Hence the answer is B and not C.
Always remember in GMAT DS Q's, they don't ask us to PROVE the statement, rather they ask us to find out.
Hi Madhav, thought of clearing your confusion. Answer is indeed B.
Is the positive integer r an even prime number?
(1) r is a prime number (2) 3 In this question, with the FS 1, it says r is a prime no. There are many prime nos and only 1 is even among all. i.e 2. So the FS1 is does not justify it. i.e when you say, 2, it is an even prime no. Justifies. When you say, 3, it is an odd prime no. Does not Justify. Here the answer becomes inconsistent. i.e first we get Yes for even for 1 prime and No for odd for other primes. Hence info is inconsistent. That eliminates A & D.
FS2 says, 3 Take 5, it is odd prime no and it's not even. Take 7, it is odd prime no and not even. Take 11, odd and not even. . . . . .Take 23, odd and not even.
Here we are getting all the answers as NO. So the data is sufficient. Hence the answer is B and not C.
Always remember in GMAT DS Q's, they don't ask us to PROVE the statement, rather they ask us to find out.
Hope this analysis helps.
Cheers
Hi red Hauster,
If you see the question pasted by alchemist mba in his original post....
Its "Is the positive integer r an even number?" and not
" Is the positive integer r an even prime number?"
If the question is the one which you typed then i will surely agree with your answer...
Just chk it once Bro... Correct me if i was wrong....
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!!)
Hi Jishu, let me try to clear your confusion. If X+Y = 20, and X U+V
1. Y+U+V = 30 2. U+V FS1 says Y+U+V=30, take any values for U,V & Y. The sum has to be 30. assume U=V=Y=10, with this we get X=10. Now check whether X+Y>U+V. The answer to this is NO. Lets take some other values.U=5, V=5,Y=20. Sums is 30. With this, we get X=0. Now check whether X+Y>U+V i.e Is 20>10? Yes. First We got NO & 2nd time we got YES. Hence it in inconsistent. So A&D; are gone.
FS2 says U+V9. Yes it is.
Take U=2, V=2,Y=3. Is 17>4? Yes
Take U=13, V=1,Y=9, X=11(by calculating eq X+Y=20). Is 20>14? Yes.
You take any values for X,Y,U,V. Fact Statement 2 will always hold true. Hence the Answer to this is B.
A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the tabletop is x sqaure feet, and the total length of the strip before it was attached was x feet. If the tabletop is 3feet wide, whats is its approximate length, in feeet ?
A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the tabletop is x sqaure feet, and the total length of the strip before it was attached was x feet. If the tabletop is 3feet wide, whats is its approximate length, in feeet ?
A) 12 b)10 C)9 D)8 E)6
lets say length of the table is l and width of the table is b
given that surface area is x, therefore l*b = x length of wire is x, therefore 2(l + b) = x
from both the equations we get 2(l + b) = l*b
put in the value of b as 3, you will get value of l as 6. hence E is correct
A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the tabletop is x sqaure feet, and the total length of the strip before it was attached was x feet. If the tabletop is 3feet wide, whats is its approximate length, in feeet ?
A) 12 b)10 C)9 D)8 E)6
Ans is E i.e 6. Calculate Area & perimeter, you shall able to do it
1) Sue's earnings is F+0.04(S1-2000) in july and F + 0.04(S2-2000) in aug from stem 1: F+0.04(S1-2000)-F-0.04(S2-2000) = 3620-3580 => Sdiff of sales in july and aug can be calculated hence suff
From stem 2: It only gives the monthly sa;ary in 2 months but we do not know anything abt her earnings in july and aug, hence insuff
Answer is A
Q2) (x-y)^4
Stem 1: Pdt of x and y is 7, x can be 1/7 and y can be 7 and vice-versa or x can be 1 and y=7 and vice versa. As nothing is clear its insuff
Stem 2: both x and y are integers. again not clear
Combining we get x=1 and y=7 and vice versa. As the exponential is even, its always +ve irrespective of what x and y might be. Hence C is suff.
What is the ratio of the number of cups of flour to the number of sugar reqrd in a certain recipe ?
a) no. of cups of flour reqrd in the recipe is 250% of the num of cups of sugar reqrd in the recipe b) 1 1/2 cups of flour than cups of sugar are required in the recipe
stem a definitely gives the ratio...stem b as well gives the ratio ..but ans seems to be A...any one explain pls ...
for b, i am taking 2 nums for ex, num of cups of sugar = 10 , 3/2 more cups of flour means 3/2(10) =15 more cups ...~25 cups of flour..which is 25/10 = 5/2
What is the ratio of the number of cups of flour to the number of sugar reqrd in a certain recipe ?
a) no. of cups of flour reqrd in the recipe is 250% of the num of cups of sugar reqrd in the recipe b) 1 1/2 cups of flour than cups of sugar are required in the recipe
stem a definitely gives the ratio...stem b as well gives the ratio ..but ans seems to be A...any one explain pls ...
for b, i am taking 2 nums for ex, num of cups of sugar = 10 , 3/2 more cups of flour means 3/2(10) =15 more cups ...~25 cups of flour..which is 25/10 = 5/2
i think the answer is A...
option a)
if no. of cups of flour = 2, then no. of cups of sugar = 250% of 2 = 5 so, ratio = 5/2
if no. of cups of flour = 3, then no. of cups of sugar = 250% of 3 = 7.5 so, ratio = 7.5/3 or 5/2
so, watever be the amount of sugar that u take, the ratio of flour:sugar will always be 5:2
hence, A alone is sufficient to answer the question
option b)
if no. of cups of sugar = 2, then no. of cups of flour = 2+1.5=3.5
so, ratio = 7/4
if no. of cups of sugar = 3, then no. of cups of flour = 3+1.5=4.5
so, ratio = 4.5/3 = 3/2
hence Balone is not sufficient to answer the question...
( At last i am not the only one!!) 