Mary had $39 more than Ivory. Mary spent
35 of her money and Ivory spent
67 of her money. In the end, Mary had 4 times as much as Ivory. Find the amount of money Ivory had at first.
| |
Mary |
Ivory |
Comparing Mary
and Ivory at first |
$39 more |
|
| Before |
5x2 =
10 u |
7x1 =
7 u |
| Change |
- 3x2 =
- 6 u |
- 6x1 =
- 6 u |
| After |
2x2 =
4 u |
1x1 =
1 u |
Comparing Mary
and Ivory in the end |
4x1 =
4 u |
1x1 =
1 u |
The amount that Mary had in the end is repeated. Make the amount that Mary had in the end the same. LCM of 4 and 2 is 4.
Amount that Mary had more than Ivory
= 10 u - 7 u
= 3 u
3 u = 39
1 u = 39 ÷ 3 = 13
Amount that Ivory had at first
= 7 u
= 7 x 13
= $91
Answer(s): $91
