The ratio of Tommy's age to Eric's age is 5 : 3. Last year, their average age was 23. How old will Eric be in 12 years' time?
|
Tommy |
Eric |
Total |
Before |
5 u - 1 |
3 u - 1 |
46 |
Change |
+ 1 |
+ 1 |
|
After |
5 u |
3 u |
48 |
Total age of Tommy and Eric this year
= 5 u + 3 u
= 8 u
Total age of Tommy and Eric this year
= 2 x 23 + 1 + 1
= 46 + 2
= 48
8 u = 48
1 u = 48 ÷ 8 = 6
Eric's age in 12 years' time
= 3 u + 12
= 3 x 6 + 12
= 18 + 12
= 30
Answer(s): 30