The ratio of Ian's money to Oscar's money is 7 : 13. If Oscar has $143, how much must he give to Ian so both will have the equal amount of money?
| |
Ian |
Oscar |
Total |
| Before |
7 u |
13 u |
20 u |
| Change |
+ 3 u |
- 3 u |
|
| After |
10 u |
10 u |
20 u |
Comparing Ian and
Oscar in the end |
1 |
1 |
|
Amount that Oscar has at first = 13 u
13 u = 143
1 u = 143 ÷ 13 = 11
Total amount that Oscar and Ian have
= 7 u + 13 u
= 20 u
Amount that each of them will have in the end
= 20 u ÷ 2
= 10 u
Amount that Oscar must give to Ian
= 10 u - 7 u
= 3 u
= 3 x 11
= $33
Answer(s): $33
