The ratio of Bryan's age to Cody's age is 7 : 1. Last year, their average age was 23. How old will Cody be in 7 years' time?
| |
Bryan |
Cody |
Total |
| Before |
7 u - 1 |
1 u - 1 |
46 |
| Change |
+ 1 |
+ 1 |
|
| After |
7 u |
1 u |
48 |
Total age of Bryan and Cody this year
= 7 u + 1 u
= 8 u
Total age of Bryan and Cody this year
= 2 x 23 + 1 + 1
= 46 + 2
= 48
8 u = 48
1 u = 48 ÷ 8 = 6
Cody's age in 7 years' time
= 1 u + 7
= 1 x 6 + 7
= 6 + 7
= 13
Answer(s): 13
