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⟩ After 10 years A will be twice the age of B before 10 years.and now if the difference is 9 years between them then what is the age of B after 10 years?

A+10=2(B-10)

&

A-B=9 i.e. A=B+9,

now,

putting it in earlier eqn.

B+19=2B-20

so B=39,

after 10 years B will be 39+10=49.

Ans =49

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