The ratio of Ian's money to Ryan's money is 7 : 15. If Ryan has $720, how much must he give to Ian so both will have the equal amount of money?
| |
Ian |
Ryan |
Total |
| Before |
7 u |
15 u |
22 u |
| Change |
+ 4 u |
- 4 u |
|
| After |
11 u |
11 u |
22 u |
Comparing Ian and
Ryan in the end |
1 |
1 |
|
Amount that Ryan has at first = 15 u
15 u = 720
1 u = 720 ÷ 15 = 48
Total amount that Ryan and Ian have
= 7 u + 15 u
= 22 u
Amount that each of them will have in the end
= 22 u ÷ 2
= 11 u
Amount that Ryan must give to Ian
= 11 u - 7 u
= 4 u
= 4 x 48
= $192
Answer(s): $192
