The ratio of Riordan's money to Archie's money is 3 : 7. If Archie has $245, how much must he give to Riordan so both will have the equal amount of money?
|
Riordan |
Archie |
Total |
Before |
3 u |
7 u |
10 u |
Change |
+ 2 u |
- 2 u |
|
After |
5 u |
5 u |
10 u |
Comparing Riordan and Archie in the end |
1 |
1 |
|
Amount that Archie has at first = 7 u
7 u = 245
1 u = 245 ÷ 7 = 35
Total amount that Archie and Riordan have
= 3 u + 7 u
= 10 u
Amount that each of them will have in the end
= 10 u ÷ 2
= 5 u
Amount that Archie must give to Riordan
= 5 u - 3 u
= 2 u
= 2 x 35
= $70
Answer(s): $70