The ratio of Justin's age to Paul's age is 2 : 1. Last year, their average age was 11. How old will Paul be in 12 years' time?
|
Justin |
Paul |
Total |
Before |
2 u - 1 |
1 u - 1 |
22 |
Change |
+ 1 |
+ 1 |
|
After |
2 u |
1 u |
24 |
Total age of Justin and Paul this year
= 2 u + 1 u
= 3 u
Total age of Justin and Paul this year
= 2 x 11 + 1 + 1
= 22 + 2
= 24
3 u = 24
1 u = 24 ÷ 3 = 8
Paul's age in 12 years' time
= 1 u + 12
= 1 x 8 + 12
= 8 + 12
= 20
Answer(s): 20