The ratio of Jenson's age to Sean's age is 5 : 3. Next year, their average age will be 17. How old will Jenson be in 7 years' time?
| |
Jenson |
Sean |
Total |
| Before |
5 u |
3 u |
32 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u + 1 |
3 u + 1 |
34 |
Total age of Jenson and Sean this year
= 5 u + 3 u
= 8 u
Total age of Jenson and Sean this year
= 2 x 17 - 1 - 1
= 34 - 2
= 32
8 u = 32
1 u = 32 ÷ 8 = 4
Jenson's age in 7 years' time
= 5 u + 7
= 5 x 4 + 7
= 20 + 7
= 27
Answer(s): 27
