Mohan is 30 years old and Donald is 51 years old. How many years ago was their ratio of ages 2:5?

20 years

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14 years

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16 years

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19 years

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None of these

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Solution

The correct option is C
16 years

Assume, ratio 2:5 happens x years ago

$\frac{30 - x}{51 - x} = \frac{2}{5} x = 16$

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