Sourish is now 25 years old while his cousin is 7 years. After how many years will Sourish's age be 2.5 times that of his cousin?
Ratio of Sourish and his cousin's present age$$= \frac{25}{7}$$
Let x be the number of years after which Sourish's age be 2.5 times that of his cousin
According to question,
$$\frac{25+x}{7+x}=\frac{5}{2}$$
$$50+2x = 35+5x$$
$$3x = 15$$
$$x=5 years$$
Option C is correct.
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