The ratio of Luke's age to Oscar's age is 2 : 1. Last year, their average age was 11. How old will Oscar be in 4 years' time?
| |
Luke |
Oscar |
Total |
| Before |
2 u - 1 |
1 u - 1 |
22 |
| Change |
+ 1 |
+ 1 |
|
| After |
2 u |
1 u |
24 |
Total age of Luke and Oscar this year
= 2 u + 1 u
= 3 u
Total age of Luke and Oscar this year
= 2 x 11 + 1 + 1
= 22 + 2
= 24
3 u = 24
1 u = 24 ÷ 3 = 8
Oscar's age in 4 years' time
= 1 u + 4
= 1 x 8 + 4
= 8 + 4
= 12
Answer(s): 12
