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For the positive integers a, b, c, and d, a is half of b, wh

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Joined: 07 Jun 2014
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GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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For the positive integers a, b, c, and d, a is half of b, wh [#permalink] New post 20 May 2018, 16:49
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Question Stats:

40% (01:24) correct 60% (01:03) wrong based on 10 sessions
For the positive integers a, b, c, and d, a is half of b, which is one-third of c. The value of d is triple that of c.

Quantity A
Quantity B
\(\frac{a+b}{c}\)
\(\frac{a+b+c}{d}\)


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
[Reveal] Spoiler: OA

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Re: For the positive integers a, b, c, and d, a is half of b, wh [#permalink] New post 27 May 2018, 19:11
sandy wrote:
For the positive integers a, b, c, and d, a is half of b, which is one-third of c. The value of d is triple that of c.

Quantity A
Quantity B
\(\frac{a+b}{c}\)
\(\frac{a+b+c}{d}\)


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.

Please provide the solution.
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Intern
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Re: For the positive integers a, b, c, and d, a is half of b, wh [#permalink] New post 28 May 2018, 02:04
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first, translate all the words into mathematical equations. so that will be:
2a=b
3b=c
d=3c

the next step is to substitute all the equations we've got. C is equal to 3b (c=3b), and we know that b = 2a. So we can write c= 3b= 3(2a)= 6a.
in other words, we state all the variable in terms of one variable (in my case, I chose variable a cause it's easy)
it will be like this:
b= 2a
c= 3b= 6a
d= 3c= 18a

the final step is to write the quantities (A and B) in terms of variable a and do the math. you'll see that quantity A and B are equal: both final result is 1/2

hope this helps :)
Re: For the positive integers a, b, c, and d, a is half of b, wh   [#permalink] 28 May 2018, 02:04
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For the positive integers a, b, c, and d, a is half of b, wh

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