Wendy and Oscar had a total of $120. After Wendy spent
57 of her money and Oscar spent $18, the ratio of Wendy's money to Kennenth's money became 1 : 5. How much money had Oscar at first?
| |
Wendy |
Oscar |
Total |
| Before |
7 u |
10 u + $18 |
$120 |
| Change |
- 5 u |
- $18 |
|
| After |
2 u |
|
|
Comparing Wendy and
Oscar in the end |
1x2 =
2 u |
5x2 =
10 u |
|
The amount that Wendy had in the end is repeated. Make the amount that Wendy had in the end the same. LCM of 2 and 1 is 2.
Total amount that Wendy and Oscar had at first
= 7 u + 10 u + 18
= 17 u + 18
17 u + 18 = 120
17 u = 120 - 18
17 u = 102
1 u = 102 ÷ 17 = 6
Amount that Oscar had at first
= 10 u + 18
= 10 x 6 + 18
= 60 + 18
= $78
Answer(s): $78
