The present age of father, 4 times of son.5 years before son age is 1/7 of his father.find the current age of son?
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let the present age of son is x
let the present age of father is 4x
x-5=1/7(4x-5)
x-5=(4x-5)/7
7x-35=4x-5
3x=30
x=10
so the present age of son is 10
so the present age of father is 40
let the present age of father is 4x
x-5=1/7(4x-5)
x-5=(4x-5)/7
7x-35=4x-5
3x=30
x=10
so the present age of son is 10
so the present age of father is 40
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