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

In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, then the present age of B is Correct Answer 39 years

Let, B's present age is x year & 10 years ago he was (x-10) After 10 years, A= 2((x-10),  B= (x+10)Now, 2(x+10)-(x+10)=9Or, x=39 years.
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