Question

5.The sum of the present ages of a father and a son is 60 years. At present the son's age is half the
father's age. Find the present age of each of them.
6. 5 years ago, the age of a father was seven times the age of a son. 5 years hence, the age of the
father will be three times the age of the son. Find their present ages.

obtain a pair of linear equation in two variables
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Answer 1

5: let the son's age be x

let the father's age be y

therefore,x+y=60 (1)

x=1/2y (2)

substituting 2 in 1,

1/2y +y =60

=3/2y=60

3y=120

y=40

x=20

6 in photo

in 6,let the father's age be x and that of the son be y