The ratio of Japheth's age to Tom's age is 5 : 4. Last year, their average age was 17. How old will Tom be in 10 years' time?
| |
Japheth |
Tom |
Total |
| Before |
5 u - 1 |
4 u - 1 |
34 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u |
4 u |
36 |
Total age of Japheth and Tom this year
= 5 u + 4 u
= 9 u
Total age of Japheth and Tom this year
= 2 x 17 + 1 + 1
= 34 + 2
= 36
9 u = 36
1 u = 36 ÷ 9 = 4
Tom's age in 10 years' time
= 4 u + 10
= 4 x 4 + 10
= 16 + 10
= 26
Answer(s): 26
