In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age… · ABC26GN1829

Subject: General Aptitude · Chapter: Problems on Ages

In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is

(a)19 years

(b)29 years

(c)39 years

(d)49 years

(e)None of these

Answer

Answer (as printed): C

Explanation

Let B's age be $x$ years. Then, A's age $=(x+9)$ years. $$(x+9)+10=2(x-10) \Rightarrow x+19=2x-20 \Rightarrow x=39.$$ B's age $=39$ years.

Explanation as extracted from the printed page; notation may be imperfect.

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