The ratio of Ethan's age to Warren's age is 7 : 1. Last year, their average age was 15. How old will Warren be in 11 years' time?
| |
Ethan |
Warren |
Total |
| Before |
7 u - 1 |
1 u - 1 |
30 |
| Change |
+ 1 |
+ 1 |
|
| After |
7 u |
1 u |
32 |
Total age of Ethan and Warren this year
= 7 u + 1 u
= 8 u
Total age of Ethan and Warren this year
= 2 x 15 + 1 + 1
= 30 + 2
= 32
8 u = 32
1 u = 32 ÷ 8 = 4
Warren's age in 11 years' time
= 1 u + 11
= 1 x 4 + 11
= 4 + 11
= 15
Answer(s): 15
