The ratio of Lee's age to Perry's age is 2 : 1. Last year, their average age was 23. How old will Perry be in 7 years' time?
| |
Lee |
Perry |
Total |
| Before |
2 u - 1 |
1 u - 1 |
46 |
| Change |
+ 1 |
+ 1 |
|
| After |
2 u |
1 u |
48 |
Total age of Lee and Perry this year
= 2 u + 1 u
= 3 u
Total age of Lee and Perry this year
= 2 x 23 + 1 + 1
= 46 + 2
= 48
3 u = 48
1 u = 48 ÷ 3 = 16
Perry's age in 7 years' time
= 1 u + 7
= 1 x 16 + 7
= 16 + 7
= 23
Answer(s): 23
