The ratio of Andy's money to Archie's money is 7 : 13. If Archie has $650, how much must he give to Andy so both will have the equal amount of money?
| |
Andy |
Archie |
Total |
| Before |
7 u |
13 u |
20 u |
| Change |
+ 3 u |
- 3 u |
|
| After |
10 u |
10 u |
20 u |
Comparing Andy and
Archie in the end |
1 |
1 |
|
Amount that Archie has at first = 13 u
13 u = 650
1 u = 650 ÷ 13 = 50
Total amount that Archie and Andy have
= 7 u + 13 u
= 20 u
Amount that each of them will have in the end
= 20 u ÷ 2
= 10 u
Amount that Archie must give to Andy
= 10 u - 7 u
= 3 u
= 3 x 50
= $150
Answer(s): $150
