The ratio of Ken's money to John's money is 3 : 7. If John has $273, how much must he give to Ken so both will have the equal amount of money?
| |
Ken |
John |
Total |
| Before |
3 u |
7 u |
10 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
5 u |
5 u |
10 u |
Comparing Ken and
John in the end |
1 |
1 |
|
Amount that John has at first = 7 u
7 u = 273
1 u = 273 ÷ 7 = 39
Total amount that John and Ken have
= 3 u + 7 u
= 10 u
Amount that each of them will have in the end
= 10 u ÷ 2
= 5 u
Amount that John must give to Ken
= 5 u - 3 u
= 2 u
= 2 x 39
= $78
Answer(s): $78
