Mary had $21 more than Barbara at first. Barbara spent
25 of her money and Mary spent
12 of her money. Given that they had equal amount of money left, how many much did Barbara have at first?
| |
Mary |
Barbara |
More |
Before |
5x1 =
5 u |
2x3 =
6 u |
1 u |
Change |
- 2x1 =
- 2 u |
- 1x3 =
- 3 u |
|
After |
3x1 =
3 u |
1x3 =
3 u |
|
Fraction of money that Barbara had left
= 1 -
25 =
35 Fraction of money that Mary had left
= 1 -
12 =
12 The amount that Mary and Barbara had left is the same. Make the amount that Mary and Barbara had left is the same. LCM of 3 and 1 is 3.
Amount that Barbara had at first = 5 u
Amount that Mary had at first = 6 u
Amount that Mary had more than Barbara at first
= 6 u - 5 u
= 1 u
= $21
Amount that Barbara had at first
= 5 u
= 5 x 21
= $105
Answer(s): $105
