A is now 19 years older than v in 10 years a will be twice as old as B find B's present age
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Step-by-step explanation:
Let B's present age = x years. Then, A's present age = (x + 9) years.
(x + 9) + 10 = 2(x - 10)
=> x + 19 = 2x - 20
=> x =39
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