Answer:
10 and 40
Explanation:
let the son's age be x then the father's age is 4x
After 20 years
son is x + 20 and father is 4x + 20
The father is now twice as old as his son , that is
4x + 20 = 2(x + 20) ← distribute parenthesis
4x + 20 = 2x + 40 ( subtract 2x from both sides )
2x + 20 = 40 ( subtract 20 from both sides )
2x = 20 ( divide both sides by 2 )
x = 10 and 4x = 4 × 10 = 40
Thir present ages are , son is 10 and father is 40