Risa had $625 more than Sarah. Risa spent 0.8 of her money and Sarah spent 30% of her money. In the end, Risa and Sarah had the same amount of money left. Find the amount of money that Risa had in the end.
|
Risa |
Sarah |
Comparing Risa and Sarah at first |
625 more |
|
Before |
5x7 = 35 u |
10x1 = 10 u |
Change |
- 4x7 = - 28 u |
- 3x1 = - 3 u |
After |
1x7 = 7 u |
7x1 = 7 u |
0.8 =
810 =
45 30% =
30100 =
310 Risa and Sarah had the same amount of money in the end. Make the amount that each had in the end the same. LCM of 1 and 7 is 7.
Amount that Risa had more than Sarah at first
= 35 u - 10 u
= 25 u
25 u = 625
1 u = 625 ÷ 25 = 25
Amount that Risa had in the end
= 7 u
= 7 x 25
= $175
Answer(s): $175