Question

a man is 3 times as old as his son who is 9 years 4 months old. how old will the father be next year​

Answer 1

Answer:

F= Father’s age

S = Son's age

For (Eq1) Father is three times as old as his son:

F = 3S

For (Eq2) In 10 year time the Father age will be twice as old as his son:

F + 10 = 2(S + 10)

F=2S+20–10

F=2S+10 (Eq2)

Then, lets us substitute the (Eq1) into the (Eq2)

3S=2S+10

3S-2S=10

S=10

Then son is 10 years old.

and Father

F=3S so 3 x 10

Father age is 30 years old.