The ratio of Andy's age to Lee's age is 2 : 1. Last year, their average age was 20. How old will Lee be in 8 years' time?
|
Andy |
Lee |
Total |
Before |
2 u - 1 |
1 u - 1 |
40 |
Change |
+ 1 |
+ 1 |
|
After |
2 u |
1 u |
42 |
Total age of Andy and Lee this year
= 2 u + 1 u
= 3 u
Total age of Andy and Lee this year
= 2 x 20 + 1 + 1
= 40 + 2
= 42
3 u = 42
1 u = 42 ÷ 3 = 14
Lee's age in 8 years' time
= 1 u + 8
= 1 x 14 + 8
= 14 + 8
= 22
Answer(s): 22