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If a / b =3/5...

Question

If $\frac{a}{b} = \frac{3}{5}$ , then value of $\frac{b}{b - a}$ is

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Solution

Given: $\frac{a}{b} = \frac{3}{5}$
Now,
$a = \frac{3 b}{5}$
Putting in the expression,
$\frac{b}{b - a} = \frac{b}{b - \frac{3 b}{5}} = \frac{5 b}{2 b} = 2.5$

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