The ratio of Paul's money to Justin's money is 1 : 5. If Justin has $90, how much must he give to Paul so both will have the equal amount of money?
| |
Paul |
Justin |
Total |
| Before |
1 u |
5 u |
6 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
3 u |
3 u |
6 u |
Comparing Paul and
Justin in the end |
1 |
1 |
|
Amount that Justin has at first = 5 u
5 u = 90
1 u = 90 ÷ 5 = 18
Total amount that Justin and Paul have
= 1 u + 5 u
= 6 u
Amount that each of them will have in the end
= 6 u ÷ 2
= 3 u
Amount that Justin must give to Paul
= 3 u - 1 u
= 2 u
= 2 x 18
= $36
Answer(s): $36
