The ratio of Jenson's age to Zeph's age is 5 : 1. Next year, their average age will be 16. How old will Jenson be in 7 years' time?
| |
Jenson |
Zeph |
Total |
| Before |
5 u |
1 u |
30 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u + 1 |
1 u + 1 |
32 |
Total age of Jenson and Zeph this year
= 5 u + 1 u
= 6 u
Total age of Jenson and Zeph this year
= 2 x 16 - 1 - 1
= 32 - 2
= 30
6 u = 30
1 u = 30 ÷ 6 = 5
Jenson's age in 7 years' time
= 5 u + 7
= 5 x 5 + 7
= 25 + 7
= 32
Answer(s): 32
