Mary had $300 more than Tina. Mary spent 0.6 of her money and Tina spent 30% of her money. In the end, Mary and Tina had the same amount of money left. Find the amount of money that Mary had in the end.
| |
Mary |
Tina |
Comparing Mary
and Tina at first |
300 more |
|
| Before |
5x7 =
35 u |
10x2 =
20 u |
| Change |
- 3x7 =
- 21 u |
- 3x2 =
- 6 u |
| After |
2x7 =
14 u |
7x2 =
14 u |
0.6 =
610 =
35 30% =
30100 =
310 Mary and Tina had the same amount of money in the end. Make the amount that each had in the end the same. LCM of 2 and 7 is 14.
Amount that Mary had more than Tina at first
= 35 u - 20 u
= 15 u
15 u = 300
1 u = 300 ÷ 15 = 20
Amount that Mary had in the end
= 14 u
= 14 x 20
= $280
Answer(s): $280
