Solve this problem with explanation..
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Present age of A be x
Present age of B be y
Difference of their age= y-x
(difference in their age will be always same)
So by condition given in question
(5/7)x - (3/5)y = y-x
Value of x is given 28, put it in the equation
20- (3/5)y =y-20
y=30
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