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If b/(a + b) = 7/12, then what does a/b equal?

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If b/(a + b) = 7/12, then what does a/b equal?  [#permalink]

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New post Updated on: 22 Feb 2017, 11:11
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If b/(a + b) = 7/12, then what does a/b equal?

A.5/12
B.5/7
C.7/5
D.7/19
E.19/12

Originally posted by vikasp99 on 21 Feb 2017, 00:58.
Last edited by Bunuel on 22 Feb 2017, 11:11, edited 1 time in total.
Edited the question.
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Re: If b/(a + b) = 7/12, then what does a/b equal?  [#permalink]

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New post 21 Feb 2017, 02:34
1
vikasp99 wrote:
If b/a + b= 7/12, then what does a/b equal?

A.5/12
B.5/7
C.7/5
D.7/19
E.19/12


Hi,

Given \(\frac{b}{a+b} = \frac{7}{12}\)

or \(\frac{a+b}{b} = \frac{12}{7}\)

=> \(\frac{a}{b} + 1 = \frac{7}{12}\)
=> \(\frac{a}{b} = \frac{5}{7}\) Answer: B.

Please modify the denominator of the question. It should be b/(a+b) = 7/12.
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Re: If b/(a + b) = 7/12, then what does a/b equal?  [#permalink]

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New post 21 Feb 2017, 02:41
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b/a + b and b/(a + b) is not the same. Please modify the question.

Cheers.
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Re: If b/(a + b) = 7/12, then what does a/b equal?  [#permalink]

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New post 22 Feb 2017, 11:07
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Hi vikasp99, Bunuel et al.

Based on the correct answer, I agree that this question is not properly formatted. Could someone please edit the original prompt accordingly?

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Re: If b/(a + b) = 7/12, then what does a/b equal?  [#permalink]

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New post 22 Feb 2017, 11:11
EMPOWERgmatRichC wrote:
Hi vikasp99, Bunuel et al.

Based on the correct answer, I agree that this question is not properly formatted. Could someone please edit the original prompt accordingly?

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Done. Thank you for noticing.
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Re: If b/(a + b) = 7/12, then what does a/b equal?  [#permalink]

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New post 22 Feb 2017, 11:39
vikasp99 wrote:
If b/(a + b) = 7/12, then what does a/b equal?

A.5/12
B.5/7
C.7/5
D.7/19
E.19/12


Hi,

A Quite easy question,b/(a + b) = 7/12

Here b=7 And a+b=12 then a=5 hence a/b=5/7
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Re: If b/(a + b) = 7/12, then what does a/b equal?  [#permalink]

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New post 23 Feb 2017, 09:51
vikasp99 wrote:
If b/(a + b) = 7/12, then what does a/b equal?

A.5/12
B.5/7
C.7/5
D.7/19
E.19/12


Let’s cross-multiply the given equation:

b/(a + b) = 7/12

12b = 7a + 7b

5b = 7a

5/7 = a/b

Answer: B
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Re: If b/(a + b) = 7/12, then what does a/b equal? &nbs [#permalink] 23 Feb 2017, 09:51
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