The ratio of Peter's age to Howard's age is 2 : 1. Next year, their average age will be 10. How old will Peter be in 2 years' time?
| |
Peter |
Howard |
Total |
| Before |
2 u |
1 u |
18 |
| Change |
+ 1 |
+ 1 |
|
| After |
2 u + 1 |
1 u + 1 |
20 |
Total age of Peter and Howard this year
= 2 u + 1 u
= 3 u
Total age of Peter and Howard this year
= 2 x 10 - 1 - 1
= 20 - 2
= 18
3 u = 18
1 u = 18 ÷ 3 = 6
Peter's age in 2 years' time
= 2 u + 2
= 2 x 6 + 2
= 12 + 2
= 14
Answer(s): 14
