Usha and Yen had $45 at first. Usha spent
57 of her money and Yen spent
78 of her money. Given that they had $54 left, how much did Usha have at first?
| |
Usha |
Yen |
Total |
| Before |
7 u |
8 p |
$45 |
| Change |
- 5 u |
- 7 p |
|
| After |
2 u |
1 p |
$54 |
7 u + 8 p = 45 --- (1)
2 u + 1 p = 54 --- (2)
(2) x 8 16 u + 8 p = 432 --- (3)
(3) - (1)
16 u - 7 u = 432 - 45
9 u = 387
1 u = 387 ÷ 9 = 43
Amount that Usha had at first
= 7 u
= 7 x 43
= $301
Answer(s): $301
