Erika had $100 more than Gem. Erika spent 0.4 of her money and Gem spent 30% of her money. In the end, Erika and Gem had the same amount of money left. Find the amount of money that Erika had in the end.
| |
Erika |
Gem |
Comparing Erika
and Gem at first |
100 more |
|
| Before |
5x7 =
35 u |
10x3 =
30 u |
| Change |
- 2x7 =
- 14 u |
- 3x3 =
- 9 u |
| After |
3x7 =
21 u |
7x3 =
21 u |
0.4 =
410 =
25 30% =
30100 =
310 Erika and Gem had the same amount of money in the end. Make the amount that each had in the end the same. LCM of 3 and 7 is 21.
Amount that Erika had more than Gem at first
= 35 u - 30 u
= 5 u
5 u = 100
1 u = 100 ÷ 5 = 20
Amount that Erika had in the end
= 21 u
= 21 x 20
= $420
Answer(s): $420
