Japheth is
r years old. Pierre is five times as old as Japheth and Eric is 10 years younger than Pierre.
- Express Eric's age in terms of r.
- Japheth is 7 years old as of now. ln how many years' time will Eric be 3 times as old as Japheth?
(a)
Japheth's age =
r years
Pierre's age = 5
r years
Eric's age = (5
r - 10) years
(b)
r = 7
Difference in age remains unchanged.
Difference in age between Eric and Japheth
= (5
r - 10) -
r = 5
r -
r - 10
= 4
r - 10
= 4 x 7 - 10
= 18 years
Difference in the age when Eric will be 3 times as old as Japheth
= 3 u - 1 u
= 2 u
2 u = 18
1 u = 18 ÷ 2 = 9
Number of years' time so Eric will be 3 times as old as Japheth
= 9 - 7
= 2 years
Answer(s): (a) (5
r - 10) years; (b) 2 years
