The ratio of Vincent's money to Billy's money is 7 : 13. If Billy has $156, how much must he give to Vincent so both will have the equal amount of money?
| |
Vincent |
Billy |
Total |
| Before |
7 u |
13 u |
20 u |
| Change |
+ 3 u |
- 3 u |
|
| After |
10 u |
10 u |
20 u |
Comparing Vincent and
Billy in the end |
1 |
1 |
|
Amount that Billy has at first = 13 u
13 u = 156
1 u = 156 ÷ 13 = 12
Total amount that Billy and Vincent have
= 7 u + 13 u
= 20 u
Amount that each of them will have in the end
= 20 u ÷ 2
= 10 u
Amount that Billy must give to Vincent
= 10 u - 7 u
= 3 u
= 3 x 12
= $36
Answer(s): $36
