The ratio of Ryan's age to Owen's age is 6 : 5. Last year, their average age was 10. How old will Owen be in 7 years' time?
| |
Ryan |
Owen |
Total |
| Before |
6 u - 1 |
5 u - 1 |
20 |
| Change |
+ 1 |
+ 1 |
|
| After |
6 u |
5 u |
22 |
Total age of Ryan and Owen this year
= 6 u + 5 u
= 11 u
Total age of Ryan and Owen this year
= 2 x 10 + 1 + 1
= 20 + 2
= 22
11 u = 22
1 u = 22 ÷ 11 = 2
Owen's age in 7 years' time
= 5 u + 7
= 5 x 2 + 7
= 10 + 7
= 17
Answer(s): 17
