The ratio of Riordan's money to Tom's money is 7 : 11. If Tom has $319, how much must he give to Riordan so both will have the equal amount of money?
| |
Riordan |
Tom |
Total |
| Before |
7 u |
11 u |
18 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
9 u |
9 u |
18 u |
Comparing Riordan and
Tom in the end |
1 |
1 |
|
Amount that Tom has at first = 11 u
11 u = 319
1 u = 319 ÷ 11 = 29
Total amount that Tom and Riordan have
= 7 u + 11 u
= 18 u
Amount that each of them will have in the end
= 18 u ÷ 2
= 9 u
Amount that Tom must give to Riordan
= 9 u - 7 u
= 2 u
= 2 x 29
= $58
Answer(s): $58
