Linda had $285 more than Lucy. Linda gave
23 of her money to Lucy. Lucy then gave 20% of her money to Linda. In the end, Linda had $109 less than Lucy. How much did Linda have at first?
| |
Linda |
Lucy |
| Comparing Linda and Lucy at first |
285 more |
|
| Before |
3 u |
+ 285 |
3 u |
|
| Change 1 |
- 2 u |
- 190 |
+ 2 u |
+ 190 |
| After 1 |
1 u |
+ 95 |
5 u |
+ 190 |
| Change 2 |
+ 1 u |
+ 38 |
- 1 u |
- 38 |
| After 2 |
2 u |
+ 133 |
4 u |
+ 152 |
23 x 285= 190
285 - 190 = 95
20% x 5 u
=
20100 x 5 u
= 1 u
20% x 190
=
20100 x 190
= 38
190 - 38 = 152
95 + 38 = 133
If Linda received another $109 in the end, Linda and Lucy would have the same amount of money.
4 u + 152 = 2 u + 133 + 109
4 u - 2 u = 133 + 109 - 152
2 u = 90
1 u = 90 ÷ 2 = 45
Amount that Linda had at first
= 3 u + 285
= 3 x 45 + 285
= 135 + 285
= $420
Answer(s): $420
