Justin is
b years old. Harry is five times as old as Justin and Sam is 6 years younger than Harry.
- Express Sam's age in terms of b.
- Justin is 9 years old as of now. ln how many years' time will Sam be 3 times as old as Justin?
(a)
Justin's age =
b years
Harry's age = 5
b years
Sam's age = (5
b - 6) years
(b)
b = 9
Difference in age remains unchanged.
Difference in age between Sam and Justin
= (5
b - 6) -
b = 5
b -
b - 6
= 4
b - 6
= 4 x 9 - 6
= 30 years
Difference in the age when Sam will be 3 times as old as Justin
= 3 u - 1 u
= 2 u
2 u = 30
1 u = 30 ÷ 2 = 15
Number of years' time so Sam will be 3 times as old as Justin
= 15 - 9
= 6 years
Answer(s): (a) (5
b - 6) years; (b) 6 years
