The ratio of Ethan's money to Mark's money is 7 : 13. If Mark has $598, how much must he give to Ethan so both will have the equal amount of money?
| |
Ethan |
Mark |
Total |
| Before |
7 u |
13 u |
20 u |
| Change |
+ 3 u |
- 3 u |
|
| After |
10 u |
10 u |
20 u |
Comparing Ethan and
Mark in the end |
1 |
1 |
|
Amount that Mark has at first = 13 u
13 u = 598
1 u = 598 ÷ 13 = 46
Total amount that Mark and Ethan have
= 7 u + 13 u
= 20 u
Amount that each of them will have in the end
= 20 u ÷ 2
= 10 u
Amount that Mark must give to Ethan
= 10 u - 7 u
= 3 u
= 3 x 46
= $138
Answer(s): $138
