Yen and Gabby had $123 at first. Yen spent
47 of her money and Gabby spent
34 of her money. Given that they had $42 left, how much did Yen have at first?
| |
Yen |
Gabby |
Total |
| Before |
7 u |
4 p |
$123 |
| Change |
- 4 u |
- 3 p |
|
| After |
3 u |
1 p |
$42 |
7 u + 4 p = 123 --- (1)
3 u + 1 p = 42 --- (2)
(2) x 4 12 u + 4 p = 168 --- (3)
(3) - (1)
12 u - 7 u = 168 - 123
5 u = 45
1 u = 45 ÷ 5 = 9
Amount that Yen had at first
= 7 u
= 7 x 9
= $63
Answer(s): $63
