The ratio of Carl's age to Warren's age is 9 : 1. Last year, their average age was 19. How old will Warren be in 4 years' time?
| |
Carl |
Warren |
Total |
| Before |
9 u - 1 |
1 u - 1 |
38 |
| Change |
+ 1 |
+ 1 |
|
| After |
9 u |
1 u |
40 |
Total age of Carl and Warren this year
= 9 u + 1 u
= 10 u
Total age of Carl and Warren this year
= 2 x 19 + 1 + 1
= 38 + 2
= 40
10 u = 40
1 u = 40 ÷ 10 = 4
Warren's age in 4 years' time
= 1 u + 4
= 1 x 4 + 4
= 4 + 4
= 8
Answer(s): 8
