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