Question

At present, the sum of the ages of a father and a son is 60. What will
be the sum of their ages after 15 years?
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Answer 1

let father's age be x and son's age be y:

x+y=60

let z be the sum of ages after 15 yrs. after 15 yrs their ages will be x+15 and y+15.

z=x+y+30

z=90

Answer 2

Answer:

90 is the correct answer