The ratio of Oscar's money to Luis's money is 5 : 9. If Luis has $18, how much must he give to Oscar so both will have the equal amount of money?
| |
Oscar |
Luis |
Total |
| Before |
5 u |
9 u |
14 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
7 u |
7 u |
14 u |
Comparing Oscar and
Luis in the end |
1 |
1 |
|
Amount that Luis has at first = 9 u
9 u = 18
1 u = 18 ÷ 9 = 2
Total amount that Luis and Oscar have
= 5 u + 9 u
= 14 u
Amount that each of them will have in the end
= 14 u ÷ 2
= 7 u
Amount that Luis must give to Oscar
= 7 u - 5 u
= 2 u
= 2 x 2
= $4
Answer(s): $4
