The ratio of Caden's age to Oliver's age is 5 : 2. Next year, their average age will be 15. How old will Caden be in 3 years' time?
| |
Caden |
Oliver |
Total |
| Before |
5 u |
2 u |
28 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u + 1 |
2 u + 1 |
30 |
Total age of Caden and Oliver this year
= 5 u + 2 u
= 7 u
Total age of Caden and Oliver this year
= 2 x 15 - 1 - 1
= 30 - 2
= 28
7 u = 28
1 u = 28 ÷ 7 = 4
Caden's age in 3 years' time
= 5 u + 3
= 5 x 4 + 3
= 20 + 3
= 23
Answer(s): 23
