The ratio of Paul's age to Julian's age is 5 : 1. Last year, their average age was 17. How old will Julian be in 11 years' time?
| |
Paul |
Julian |
Total |
| Before |
5 u - 1 |
1 u - 1 |
34 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u |
1 u |
36 |
Total age of Paul and Julian this year
= 5 u + 1 u
= 6 u
Total age of Paul and Julian this year
= 2 x 17 + 1 + 1
= 34 + 2
= 36
6 u = 36
1 u = 36 ÷ 6 = 6
Julian's age in 11 years' time
= 1 u + 11
= 1 x 6 + 11
= 6 + 11
= 17
Answer(s): 17
