The ratio of Charlie's age to Howard's age is 6 : 1. Last year, their average age was 20. How old will Howard be in 11 years' time?
|
Charlie |
Howard |
Total |
Before |
6 u - 1 |
1 u - 1 |
40 |
Change |
+ 1 |
+ 1 |
|
After |
6 u |
1 u |
42 |
Total age of Charlie and Howard this year
= 6 u + 1 u
= 7 u
Total age of Charlie and Howard this year
= 2 x 20 + 1 + 1
= 40 + 2
= 42
7 u = 42
1 u = 42 ÷ 7 = 6
Howard's age in 11 years' time
= 1 u + 11
= 1 x 6 + 11
= 6 + 11
= 17
Answer(s): 17