The present age of father is four times the age of his son .After 10 years ,age of father will became three time the age of his son .Find their present age.
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Let son's age be x.
Father's age = 4x
After 10 years :-
Son's age = x+10
Father's age = 4x+10
A.T.Q.
3(x + 10) = 4x + 10
3x + 30 = 4x + 10
3x-4x = 10-30
-x = -20
x = 20
Son's age = x = 20 years
Father's age = 4x = 4×20 = 80 years
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Father's age = 4x
After 10 years :-
Son's age = x+10
Father's age = 4x+10
A.T.Q.
3(x + 10) = 4x + 10
3x + 30 = 4x + 10
3x-4x = 10-30
-x = -20
x = 20
Son's age = x = 20 years
Father's age = 4x = 4×20 = 80 years
Hope it helps you ☺
Please mark as Brainliest ☺
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