The ratio of Jack's age to Fabian's age is 3 : 1. Last year, their average age was 13. How old will Fabian be in 9 years' time?
|
Jack |
Fabian |
Total |
Before |
3 u - 1 |
1 u - 1 |
26 |
Change |
+ 1 |
+ 1 |
|
After |
3 u |
1 u |
28 |
Total age of Jack and Fabian this year
= 3 u + 1 u
= 4 u
Total age of Jack and Fabian this year
= 2 x 13 + 1 + 1
= 26 + 2
= 28
4 u = 28
1 u = 28 ÷ 4 = 7
Fabian's age in 9 years' time
= 1 u + 9
= 1 x 7 + 9
= 7 + 9
= 16
Answer(s): 16