The ratio of Harry's age to Tim's age is 5 : 3. Last year, their average age was 15. How old will Tim be in 6 years' time?
| |
Harry |
Tim |
Total |
| Before |
5 u - 1 |
3 u - 1 |
30 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u |
3 u |
32 |
Total age of Harry and Tim this year
= 5 u + 3 u
= 8 u
Total age of Harry and Tim this year
= 2 x 15 + 1 + 1
= 30 + 2
= 32
8 u = 32
1 u = 32 ÷ 8 = 4
Tim's age in 6 years' time
= 3 u + 6
= 3 x 4 + 6
= 12 + 6
= 18
Answer(s): 18
