Shiyun had $49 more than Risa at first. After Shiyun and Risa spent an equal amount of money, Risa had
310 as much as Shiyun. How much money did Shiyun have left?
| |
Shiyun |
Risa |
Difference |
| Before |
1 u + $49 |
1 u |
$49 |
| Change |
- 1 |
- 1 |
|
| After |
10 p |
3 p |
7 p |
Difference in the amounts between Shiyun and Risa
= 10 p - 3 p
= 7 p
Since both Shiyun and Risa spent an equal amount, the difference in the amounts that Shiyun and Risa had at first and in the end remains unchanged.
7 p = 49
1 p = 49 ÷ 7 = 7
Amount that Shiyun had left
= 10 p
= 10 x 7
= $70
Answer(s): $70
