What was the age of Sonu 10 years ago?
I. Ram is seven years older than Sonu.
II. The ratio of Ram’s present age to Sonu’s is 5:4.
III. The difference between the age of Ram and that of Keshav is 12 years.
Let Sonu’s present age be x years. ∴ Ram’s present age is (x + 7) years From II (x + 7)/x = 5/4 ∴ 4 x + 28 = 5 x x = 28 Hence, Sonu’s age 10 years ago = 28 – 10 = 18 years Thus, From I and From II, we can find the age of Sonu.
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