The ratio of Oscar's age to Dylan's age is 5 : 1. Last year, their average age was 23. How old will Dylan be in 10 years' time?
|
Oscar |
Dylan |
Total |
Before |
5 u - 1 |
1 u - 1 |
46 |
Change |
+ 1 |
+ 1 |
|
After |
5 u |
1 u |
48 |
Total age of Oscar and Dylan this year
= 5 u + 1 u
= 6 u
Total age of Oscar and Dylan this year
= 2 x 23 + 1 + 1
= 46 + 2
= 48
6 u = 48
1 u = 48 ÷ 6 = 8
Dylan's age in 10 years' time
= 1 u + 10
= 1 x 8 + 10
= 8 + 10
= 18
Answer(s): 18