Kathy, Jane and Emily had a sum of money. The amount of money Kathy had was
45 of the amount of money Jane had. The ratio of the amount of money Jane had to the total amount of money Emily and Jane had was 4: 9. After Emily gave $100 to Jane, she had as much money as Jane. How much more money did Emily have than Kathy in the end?
Kathy |
Jane |
Emily |
4x4 = 16 u |
5x4 = 20 u |
|
|
4x5 = 20 u |
5x5 = 25 u |
16 u |
20 u |
25 u |
The amount that Jane had is the repeated identity. Make the amount that Jane had the same. LCM of 5 and 4 is 20.
|
Kathy |
Jane |
Emily |
Before |
16 u |
20 u |
25 u |
Change |
No change |
+ 100 |
- 100 |
After |
16 u |
20 u + 100 |
25 u - 100 |
The amount that Emily and Jane had in the end is the same.
25 u - 100 = 20 u + 100
25 u - 20 u = 100 + 100
5 u = 200
1 u = 200 ÷ 5 = 40
Amount that Emily had more than Kathy in the end
= 25 u - 100 - 16 u
= 9 u - 100
= 9 x 40 - 100
= 360 - 100
= $260
Answer(s): $260