The ratio of Warren's age to Harry's age is 7 : 5. Next year, their average age will be 13. How old will Warren be in 3 years' time?
| |
Warren |
Harry |
Total |
| Before |
7 u |
5 u |
24 |
| Change |
+ 1 |
+ 1 |
|
| After |
7 u + 1 |
5 u + 1 |
26 |
Total age of Warren and Harry this year
= 7 u + 5 u
= 12 u
Total age of Warren and Harry this year
= 2 x 13 - 1 - 1
= 26 - 2
= 24
12 u = 24
1 u = 24 ÷ 12 = 2
Warren's age in 3 years' time
= 7 u + 3
= 7 x 2 + 3
= 14 + 3
= 17
Answer(s): 17
