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a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3

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a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3 [#permalink] New post 13 Oct 2017, 04:33
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a:b = 3:1, a:d = 15:2, c:e = 7:9, c:d = 10:3

If e = 60, what is the value of b?

A 20
B 35
C 70
d 180
E The value cannot be determined from the information given
[Reveal] Spoiler: OA

Last edited by cicilvikas on 13 Oct 2017, 10:01, edited 1 time in total.
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Re: a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3 [#permalink] New post 13 Oct 2017, 08:00
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cicilvikas wrote:
a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3



Could you check the question -

c:d = 7:9 , c:d = 10:3
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Re: a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3 [#permalink] New post 13 Oct 2017, 10:02
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Apologies for the typo. It's fixed now
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Re: a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3 [#permalink] New post 13 Oct 2017, 10:14
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cicilvikas wrote:
Apologies for the typo. It's fixed now


No worries,

Now to the ques
we can have

a=\frac{(15d)}{2}

b =\frac{(5d)}{2}(since a = 3b)

d= \frac{(3c)}{10}

c = \frac{(7e)}{(9)}
=\frac{(7*60)}{(9)}

Now d = \frac{(3*7*60)}{(10*9)} = 14

therefore b= \frac{(5*14)}{2} = 35
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Re: a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3   [#permalink] 13 Oct 2017, 10:14
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a:b = 3:1, a:d = 15:2, c:d = 7:9, c:d = 10:3

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