The ratio of Howard's age to Perry's age is 2 : 1. Last year, their average age was 20. How old will Perry be in 5 years' time?
|
Howard |
Perry |
Total |
Before |
2 u - 1 |
1 u - 1 |
40 |
Change |
+ 1 |
+ 1 |
|
After |
2 u |
1 u |
42 |
Total age of Howard and Perry this year
= 2 u + 1 u
= 3 u
Total age of Howard and Perry this year
= 2 x 20 + 1 + 1
= 40 + 2
= 42
3 u = 42
1 u = 42 ÷ 3 = 14
Perry's age in 5 years' time
= 1 u + 5
= 1 x 14 + 5
= 14 + 5
= 19
Answer(s): 19