Gabby and Penelope had $21 at first. Gabby spent
47 of her money and Penelope spent
34 of her money. Given that they had $49 left, how much did Gabby have at first?
|
Gabby |
Penelope |
Total |
Before |
7 u |
4 p |
$21 |
Change |
- 4 u |
- 3 p |
|
After |
3 u |
1 p |
$49 |
7 u + 4 p = 21 --- (1)
3 u + 1 p = 49 --- (2)
(2) x 4 12 u + 4 p = 196 --- (3)
(3) - (1)
12 u - 7 u = 196 - 21
5 u = 175
1 u = 175 ÷ 5 = 35
Amount that Gabby had at first
= 7 u
= 7 x 35
= $245
Answer(s): $245