The ratio of Luke's age to Julian's age is 6 : 5. Last year, their average age was 10. How old will Julian be in 5 years' time?
| |
Luke |
Julian |
Total |
| Before |
6 u - 1 |
5 u - 1 |
20 |
| Change |
+ 1 |
+ 1 |
|
| After |
6 u |
5 u |
22 |
Total age of Luke and Julian this year
= 6 u + 5 u
= 11 u
Total age of Luke and Julian this year
= 2 x 10 + 1 + 1
= 20 + 2
= 22
11 u = 22
1 u = 22 ÷ 11 = 2
Julian's age in 5 years' time
= 5 u + 5
= 5 x 2 + 5
= 10 + 5
= 15
Answer(s): 15
