Present age of A and B are 20 and 5 years reapectively.after how many years will be the age A twice that of B
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let the required years be X. after the years X the age of A will be A+X and B will be B+X .
A+X = 2(B+X)
A+X = 2B+2x
20+X=10+ 2x
20-10=2x-x
X=10
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