The ratio of Julian's age to Japheth's age is 2 : 1. Next year, their average age will be 19. How old will Julian be in 9 years' time?
|
Julian |
Japheth |
Total |
Before |
2 u |
1 u |
36 |
Change |
+ 1 |
+ 1 |
|
After |
2 u + 1 |
1 u + 1 |
38 |
Total age of Julian and Japheth this year
= 2 u + 1 u
= 3 u
Total age of Julian and Japheth this year
= 2 x 19 - 1 - 1
= 38 - 2
= 36
3 u = 36
1 u = 36 ÷ 3 = 12
Julian's age in 9 years' time
= 2 u + 9
= 2 x 12 + 9
= 24 + 9
= 33
Answer(s): 33