The ratio of Neave's age to Riordan's age is 5 : 1. Next year, their average age will be 13. How old will Neave be in 4 years' time?
|
Neave |
Riordan |
Total |
Before |
5 u |
1 u |
24 |
Change |
+ 1 |
+ 1 |
|
After |
5 u + 1 |
1 u + 1 |
26 |
Total age of Neave and Riordan this year
= 5 u + 1 u
= 6 u
Total age of Neave and Riordan this year
= 2 x 13 - 1 - 1
= 26 - 2
= 24
6 u = 24
1 u = 24 ÷ 6 = 4
Neave's age in 4 years' time
= 5 u + 4
= 5 x 4 + 4
= 20 + 4
= 24
Answer(s): 24