Answer:
son is 4 and father is 32
Explanation:
let son's age be s then father is s + 28
In 3 years
son is s + 3 and father is s + 28 + 3 = s + 31
At this time the father is 5 times as old as his son , that is
s + 31 = 5(s + 3) ← distribute parenthesis
s + 31 = 5s + 15 ( subtract s from both sides )
31 = 4s + 15 ( subtract 15 from both sides )
16 = 4s ( divide both sides by 4 )
4 = s
son's age is 4
father's age is 4 + 28 = 32