Justin is
a years old. Sean is six times as old as Justin and Jeremy is 7 years younger than Sean.
- Express Jeremy's age in terms of a.
- Justin is 5 years old as of now. ln how many years' time will Jeremy be 3 times as old as Justin?
(a)
Justin's age =
a years
Sean's age = 6
a years
Jeremy's age = (6
a - 7) years
(b)
a = 5
Difference in age remains unchanged.
Difference in age between Jeremy and Justin
= (6
a - 7) -
a = 6
a -
a - 7
= 5
a - 7
= 5 x 5 - 7
= 18 years
Difference in the age when Jeremy will be 3 times as old as Justin
= 3 u - 1 u
= 2 u
2 u = 18
1 u = 18 ÷ 2 = 9
Number of years' time so Jeremy will be 3 times as old as Justin
= 9 - 5
= 4 years
Answer(s): (a) (6
a - 7) years; (b) 4 years
