The ratio of Seth's age to Charlie's age is 9 : 8. Last year, their average age was 16. How old will Charlie be in 10 years' time?
| |
Seth |
Charlie |
Total |
| Before |
9 u - 1 |
8 u - 1 |
32 |
| Change |
+ 1 |
+ 1 |
|
| After |
9 u |
8 u |
34 |
Total age of Seth and Charlie this year
= 9 u + 8 u
= 17 u
Total age of Seth and Charlie this year
= 2 x 16 + 1 + 1
= 32 + 2
= 34
17 u = 34
1 u = 34 ÷ 17 = 2
Charlie's age in 10 years' time
= 8 u + 10
= 8 x 2 + 10
= 16 + 10
= 26
Answer(s): 26
