Riordan is
c years old. Tim is six times as old as Riordan and Zeph is 9 years younger than Tim.
- Express Zeph's age in terms of c.
- Riordan is 9 years old as of now. ln how many years' time will Zeph be 3 times as old as Riordan?
(a)
Riordan's age =
c years
Tim's age = 6
c years
Zeph's age = (6
c - 9) years
(b)
c = 9
Difference in age remains unchanged.
Difference in age between Zeph and Riordan
= (6
c - 9) -
c = 6
c -
c - 9
= 5
c - 9
= 5 x 9 - 9
= 36 years
Difference in the age when Zeph will be 3 times as old as Riordan
= 3 u - 1 u
= 2 u
2 u = 36
1 u = 36 ÷ 2 = 18
Number of years' time so Zeph will be 3 times as old as Riordan
= 18 - 9
= 9 years
Answer(s): (a) (6
c - 9) years; (b) 9 years
