Wendy and Penelope had $71 at first. Wendy spent
47 of her money and Penelope spent
56 of her money. Given that they had $21 left, how much did Wendy have at first?
| |
Wendy |
Penelope |
Total |
| Before |
7 u |
6 p |
$71 |
| Change |
- 4 u |
- 5 p |
|
| After |
3 u |
1 p |
$21 |
7 u + 6 p = 71 --- (1)
3 u + 1 p = 21 --- (2)
(2) x 6 18 u + 6 p = 126 --- (3)
(3) - (1)
18 u - 7 u = 126 - 71
11 u = 55
1 u = 55 ÷ 11 = 5
Amount that Wendy had at first
= 7 u
= 7 x 5
= $35
Answer(s): $35
