The ratio of Zane's age to Vincent's age is 5 : 3. Last year, their average age was 15. How old will Vincent be in 2 years' time?
|
Zane |
Vincent |
Total |
Before |
5 u - 1 |
3 u - 1 |
30 |
Change |
+ 1 |
+ 1 |
|
After |
5 u |
3 u |
32 |
Total age of Zane and Vincent this year
= 5 u + 3 u
= 8 u
Total age of Zane and Vincent this year
= 2 x 15 + 1 + 1
= 30 + 2
= 32
8 u = 32
1 u = 32 ÷ 8 = 4
Vincent's age in 2 years' time
= 3 u + 2
= 3 x 4 + 2
= 12 + 2
= 14
Answer(s): 14