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If x/y = c/d and

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boomgoesthegmat Senior | Next Rank: 100 Posts Default Avatar
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If x/y = c/d and

Post Wed May 04, 2016 4:41 am
If x/y = c/d and d/c = b/a , which of the following must be true?

I. y/x = b/a
II. x/a = y/b
III. y/a = x/b

A) I only
B) II only
C) I and II only
D) I and III only
E) 1, II and III

OA: C

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boomgoesthegmat Senior | Next Rank: 100 Posts Default Avatar
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Post Thu May 05, 2016 8:40 pm
Nice solution regor60!

Anyone out there have any other ways to solve it or is that the best way?

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regor60 Master | Next Rank: 500 Posts Default Avatar
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Post Wed May 04, 2016 6:32 am
boomgoesthegmat wrote:
If x/y = c/d and d/c = b/a , which of the following must be true?

I. y/x = b/a
II. x/a = y/b
III. y/a = x/b

A) I only
B) II only
C) I and II only
D) I and III only
E) 1, II and III

OA: C
I found it easy to assign actual numbers and then test the answers, for example:

4/2 = 6/3 and

3/6 = 5/10

by substituting each of these into the answer choices, it becomes clear

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