The ratio of Albert's age to Ethan's age is 9 : 1. Last year, their average age was 14. How old will Ethan be in 5 years' time?
| |
Albert |
Ethan |
Total |
| Before |
9 u - 1 |
1 u - 1 |
28 |
| Change |
+ 1 |
+ 1 |
|
| After |
9 u |
1 u |
30 |
Total age of Albert and Ethan this year
= 9 u + 1 u
= 10 u
Total age of Albert and Ethan this year
= 2 x 14 + 1 + 1
= 28 + 2
= 30
10 u = 30
1 u = 30 ÷ 10 = 3
Ethan's age in 5 years' time
= 1 u + 5
= 1 x 3 + 5
= 3 + 5
= 8
Answer(s): 8
