The ratio of Fred's money to Lee's money is 7 : 13. If Lee has $39, how much must he give to Fred so both will have the equal amount of money?
|
Fred |
Lee |
Total |
Before |
7 u |
13 u |
20 u |
Change |
+ 3 u |
- 3 u |
|
After |
10 u |
10 u |
20 u |
Comparing Fred and Lee in the end |
1 |
1 |
|
Amount that Lee has at first = 13 u
13 u = 39
1 u = 39 ÷ 13 = 3
Total amount that Lee and Fred have
= 7 u + 13 u
= 20 u
Amount that each of them will have in the end
= 20 u ÷ 2
= 10 u
Amount that Lee must give to Fred
= 10 u - 7 u
= 3 u
= 3 x 3
= $9
Answer(s): $9