The ratio of Reggie's age to Daniel's age is 9 : 5. Last year, their average age was 13. How old will Daniel be in 10 years' time?
| |
Reggie |
Daniel |
Total |
| Before |
9 u - 1 |
5 u - 1 |
26 |
| Change |
+ 1 |
+ 1 |
|
| After |
9 u |
5 u |
28 |
Total age of Reggie and Daniel this year
= 9 u + 5 u
= 14 u
Total age of Reggie and Daniel this year
= 2 x 13 + 1 + 1
= 26 + 2
= 28
14 u = 28
1 u = 28 ÷ 14 = 2
Daniel's age in 10 years' time
= 5 u + 10
= 5 x 2 + 10
= 10 + 10
= 20
Answer(s): 20
