Fanny, Raeann and Opal had a sum of money. The amount of money Fanny had was
45 of the amount of money Raeann had. The ratio of the amount of money Raeann had to the total amount of money Opal and Raeann had was 3: 7. After Opal gave $100 to Raeann, she had as much money as Raeann. How much more money did Opal have than Fanny in the end?
Fanny |
Raeann |
Opal |
4x3 = 12 u |
5x3 = 15 u |
|
|
3x5 = 15 u |
4x5 = 20 u |
12 u |
15 u |
20 u |
The amount that Raeann had is the repeated identity. Make the amount that Raeann had the same. LCM of 5 and 3 is 15.
|
Fanny |
Raeann |
Opal |
Before |
12 u |
15 u |
20 u |
Change |
No change |
+ 100 |
- 100 |
After |
12 u |
15 u + 100 |
20 u - 100 |
The amount that Opal and Raeann had in the end is the same.
20 u - 100 = 15 u + 100
20 u - 15 u = 100 + 100
5 u = 200
1 u = 200 ÷ 5 = 40
Amount that Opal had more than Fanny in the end
= 20 u - 100 - 12 u
= 8 u - 100
= 8 x 40 - 100
= 320 - 100
= $220
Answer(s): $220