The ratio of Fred's age to Japheth's age is 7 : 3. Last year, their average age was 14. How old will Japheth be in 6 years' time?
| |
Fred |
Japheth |
Total |
| Before |
7 u - 1 |
3 u - 1 |
28 |
| Change |
+ 1 |
+ 1 |
|
| After |
7 u |
3 u |
30 |
Total age of Fred and Japheth this year
= 7 u + 3 u
= 10 u
Total age of Fred and Japheth this year
= 2 x 14 + 1 + 1
= 28 + 2
= 30
10 u = 30
1 u = 30 ÷ 10 = 3
Japheth's age in 6 years' time
= 3 u + 6
= 3 x 3 + 6
= 9 + 6
= 15
Answer(s): 15
