The ratio of Ryan's age to Jenson's age is 4 : 1. Last year, their average age was 14. How old will Jenson be in 9 years' time?
| |
Ryan |
Jenson |
Total |
| Before |
4 u - 1 |
1 u - 1 |
28 |
| Change |
+ 1 |
+ 1 |
|
| After |
4 u |
1 u |
30 |
Total age of Ryan and Jenson this year
= 4 u + 1 u
= 5 u
Total age of Ryan and Jenson this year
= 2 x 14 + 1 + 1
= 28 + 2
= 30
5 u = 30
1 u = 30 ÷ 5 = 6
Jenson's age in 9 years' time
= 1 u + 9
= 1 x 6 + 9
= 6 + 9
= 15
Answer(s): 15
