Justin is
j years old. Andy is four times as old as Justin and Zeph is 6 years younger than Andy.
- Express Zeph's age in terms of j.
- Justin is 10 years old as of now. ln how many years' time will Zeph be 3 times as old as Justin?
(a)
Justin's age =
j years
Andy's age = 4
j years
Zeph's age = (4
j - 6) years
(b)
j = 10
Difference in age remains unchanged.
Difference in age between Zeph and Justin
= (4
j - 6) -
j = 4
j -
j - 6
= 3
j - 6
= 3 x 10 - 6
= 24 years
Difference in the age when Zeph will be 3 times as old as Justin
= 3 u - 1 u
= 2 u
2 u = 24
1 u = 24 ÷ 2 = 12
Number of years' time so Zeph will be 3 times as old as Justin
= 12 - 10
= 2 years
Answer(s): (a) (4
j - 6) years; (b) 2 years