The ratio of Perry's money to Riordan's money is 1 : 5. If Riordan has $80, how much must he give to Perry so both will have the equal amount of money?
| |
Perry |
Riordan |
Total |
| Before |
1 u |
5 u |
6 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
3 u |
3 u |
6 u |
Comparing Perry and
Riordan in the end |
1 |
1 |
|
Amount that Riordan has at first = 5 u
5 u = 80
1 u = 80 ÷ 5 = 16
Total amount that Riordan and Perry have
= 1 u + 5 u
= 6 u
Amount that each of them will have in the end
= 6 u ÷ 2
= 3 u
Amount that Riordan must give to Perry
= 3 u - 1 u
= 2 u
= 2 x 16
= $32
Answer(s): $32
