Sarah had $150 less than Opal. Opal spent 0.8 of her money and Sarah spent 20% of her money. In the end, Opal and Sarah had the same amount of money left. Find the amount of money that Opal had at first.
| |
Sarah |
Opal |
Comparing Opal
and Sarah at first |
|
150 more |
| Before |
5x1 =
5 u |
5x4 =
20 u |
| Change |
- 1x1 =
- 1 u |
- 4x4 =
- 16 u |
| After |
4x1 =
4 u |
1x4 =
4 u |
0.8 =
810 =
45 20% =
20100 =
15 Sarah and Opal had the same amount of money in the end. Make the amount that each had in the end the same. LCM of 1 and 4 is 4.
Amount that Sarah had less than Opal at first
= 20 u - 5 u
= 15 u
15 u = 150
1 u = 150 ÷ 15 = 10
Amount that Opal had at first
= 20 u
= 20 x 10
= $200
Answer(s): $200
