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x = 40
y =10
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present age of son=X+5=5+5=10yrs
present age of father=7x+5=7(5)+5=35+5=40yrs
Step-by-step explanation:
let age of son=X
his father's age=7x
present ages
age of son=X+5
his father's age=7x+5
After 5 years
age of son=X+10
his father's age=7x+10
7x+10=3(X+10)
7x+10=3x+30
7x-3x=30-10
4x=20
X=20/4
X=5
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