Rajini is 7 times as oldas his son .after 3 years he will be 5 times his sons age.what is rajinis present age

Question

Answer 1

rajini's age - 42.
let r's age be x
let sons age be y
x = 7y ------------eqA
after 3 years
x+3=r's age , y+3= sons age
x+3 = 5(y+3)
x+3 = 5y +15
x= 5y +12 -------eqB

by elimination, X= 42

Answer 2

rajini's age - 42.
let r's age be x
let sons age be y
x = 7y ------------eqA
after 3 years
x+3=r's age , y+3= sons age
x+3 = 5(y+3)
x+3 = 5y +15
x= 5y +12 -------eqB

by elimination, X= 42

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Rajini is 7 times as oldas his son .after 3 years he will be 5 times his sons age.what is rajinis present age