The ratio of Riordan's money to Luke's money is 5 : 13. If Luke has $91, how much must he give to Riordan so both will have the equal amount of money?
| |
Riordan |
Luke |
Total |
| Before |
5 u |
13 u |
18 u |
| Change |
+ 4 u |
- 4 u |
|
| After |
9 u |
9 u |
18 u |
Comparing Riordan and
Luke in the end |
1 |
1 |
|
Amount that Luke has at first = 13 u
13 u = 91
1 u = 91 ÷ 13 = 7
Total amount that Luke and Riordan have
= 5 u + 13 u
= 18 u
Amount that each of them will have in the end
= 18 u ÷ 2
= 9 u
Amount that Luke must give to Riordan
= 9 u - 5 u
= 4 u
= 4 x 7
= $28
Answer(s): $28
