The ratio of Jeremy's age to Ethan's age is 5 : 3. Last year, their average age was 11. How old will Ethan be in 7 years' time?
| |
Jeremy |
Ethan |
Total |
| Before |
5 u - 1 |
3 u - 1 |
22 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u |
3 u |
24 |
Total age of Jeremy and Ethan this year
= 5 u + 3 u
= 8 u
Total age of Jeremy and Ethan this year
= 2 x 11 + 1 + 1
= 22 + 2
= 24
8 u = 24
1 u = 24 ÷ 8 = 3
Ethan's age in 7 years' time
= 3 u + 7
= 3 x 3 + 7
= 9 + 7
= 16
Answer(s): 16
