The ratio of Harry's age to Zane's age is 3 : 1. Last year, their average age was 13. How old will Zane be in 7 years' time?
| |
Harry |
Zane |
Total |
| Before |
3 u - 1 |
1 u - 1 |
26 |
| Change |
+ 1 |
+ 1 |
|
| After |
3 u |
1 u |
28 |
Total age of Harry and Zane this year
= 3 u + 1 u
= 4 u
Total age of Harry and Zane this year
= 2 x 13 + 1 + 1
= 26 + 2
= 28
4 u = 28
1 u = 28 ÷ 4 = 7
Zane's age in 7 years' time
= 1 u + 7
= 1 x 7 + 7
= 7 + 7
= 14
Answer(s): 14
