Mary had $135 less than Shannon. Shannon gave
23 of her money to Mary. Mary then gave 20% of her money to Shannon. In the end, Mary had $181 more than Shannon. How much did Mary have at first?
| |
Shannon |
Mary |
| Comparing Shannon and Mary at first |
135 more |
|
| Before |
3 u |
+ 135 |
3 u |
|
| Change 1 |
- 2 u |
- 90 |
+ 2 u |
+ 90 |
| After 1 |
1 u |
+ 45 |
5 u |
+ 90 |
| Change 2 |
+ 1 u |
+ 18 |
- 1 u |
- 18 |
| After 2 |
2 u |
+ 63 |
4 u |
+ 72 |
23 x 135= 90
135 - 90 = 45
20% x 5 u
=
20100 x 5 u
= 1 u
20% x 90
=
20100 x 90
= 18
90 - 18 = 72
45 + 18 = 63
If Shannon received another $181 in the end, Shannon and Mary would have the same amount of money.
4 u + 72 = 2 u + 63 + 181
4 u - 2 u = 63 + 181 - 72
2 u = 172
1 u = 172 ÷ 2 = 86
Amount that Mary had at first
= 3 u
= 3 x 86
= $258
Answer(s): $258
