The ratio of Zane's age to Ahmad's age is 3 : 1. Next year, their average age will be 19. How old will Zane be in 9 years' time?
| |
Zane |
Ahmad |
Total |
| Before |
3 u |
1 u |
36 |
| Change |
+ 1 |
+ 1 |
|
| After |
3 u + 1 |
1 u + 1 |
38 |
Total age of Zane and Ahmad this year
= 3 u + 1 u
= 4 u
Total age of Zane and Ahmad this year
= 2 x 19 - 1 - 1
= 38 - 2
= 36
4 u = 36
1 u = 36 ÷ 4 = 9
Zane's age in 9 years' time
= 3 u + 9
= 3 x 9 + 9
= 27 + 9
= 36
Answer(s): 36
