The age of A and b in the ratio 5 and 7 . Four years from now the ratio of their ages will be 3and 4 .Then the present age of B is
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let A's age be 5x
B's age will be 7x
5x+4/7x+4=3/4
20x+16=21x+12
x=4
age of b is 7x=7*4=28
B's age will be 7x
5x+4/7x+4=3/4
20x+16=21x+12
x=4
age of b is 7x=7*4=28
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