What must be added to each term of the ratio 2 : 3, so that it may become equal to 4 : 5?

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Solution

The correct option is B
2

Let the number to be added be x, then (2 + x):(3 + x) = 4 : 5

$\Rightarrow \frac{2 + x}{3 + x} = \frac{4}{5} \Rightarrow 5 (2 + x) = 4 (3 + x) \Rightarrow 10 + 5 x = 12 + 4 x \Rightarrow 5 x - 4 x = 12 - 10 \Rightarrow x = 2$

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