The ratio of Xavier's age to Rael's age is 10 : 3. Last year, their average age was 12. How old will Rael be in 11 years' time?
| |
Xavier |
Rael |
Total |
| Before |
10 u - 1 |
3 u - 1 |
24 |
| Change |
+ 1 |
+ 1 |
|
| After |
10 u |
3 u |
26 |
Total age of Xavier and Rael this year
= 10 u + 3 u
= 13 u
Total age of Xavier and Rael this year
= 2 x 12 + 1 + 1
= 24 + 2
= 26
13 u = 26
1 u = 26 ÷ 13 = 2
Rael's age in 11 years' time
= 3 u + 11
= 3 x 2 + 11
= 6 + 11
= 17
Answer(s): 17
