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If a : b = 3 : 5 and a :c = 5:7, what (b...

If `a : b = 3 : 5 and a :c = 5:7`, what `(b - c): (b + c)` equal to?

A

`4:46`

B

`49:4`

C

`5:48`

D

`48:5`

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