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If a: (b+c) = 1:3 and c: (a+ b) = 5:7, t...

If `a: (b+c) = 1:3` and `c: (a+ b) = 5:7`, then `b: (a+c)` is equal to:

A

`1:2`

B

`2:3`

C

`1:3`

D

`2:1`

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The correct Answer is:
A
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