If $(30 + x) : (23 + x) = 5 : 4$ then find the value of x.

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Solution

The correct option is A 5
$=> 30 + x : 23 + x = 5 : 4$
$=> \frac{30 + x}{23 + x} = \frac{5}{4}$
Cross multiplying,
$120 + 4 x = 115 + 5 x$
$120 - 115 = 5 x - 4 x$
$x = 5$

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