The ratio of Justin's money to Michael's money is 3 : 7. If Michael has $210, how much must he give to Justin so both will have the equal amount of money?
| |
Justin |
Michael |
Total |
| Before |
3 u |
7 u |
10 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
5 u |
5 u |
10 u |
Comparing Justin and
Michael in the end |
1 |
1 |
|
Amount that Michael has at first = 7 u
7 u = 210
1 u = 210 ÷ 7 = 30
Total amount that Michael and Justin have
= 3 u + 7 u
= 10 u
Amount that each of them will have in the end
= 10 u ÷ 2
= 5 u
Amount that Michael must give to Justin
= 5 u - 3 u
= 2 u
= 2 x 30
= $60
Answer(s): $60
