Mrs Zhang gave Risa and Jean some money each on Thursday. On Friday, Risa gave
16 of the amount she had to Jean. On Saturday, Jean gave
14 of the amount she had to Risa. In the end, Risa had $70 and Jean had $30. How much did Jean had more than Risa at first?
| |
Risa |
Jean |
Total |
| Before 1 |
6 u |
? |
$100 |
| Change 1 |
- 1 u |
+ 1 u |
|
| After 1 |
5 u |
4 p |
$100 |
| Before 2 |
$70 - 1 p |
4 p |
$100 |
| Change 2 |
+ 1 p |
- 1 p |
|
After 2 |
$70 |
3 p
($30) |
$100 |
Amount that Jean had in the end = 3 p
3 p = 30
1 p = 30 ÷ 3 = 10
Working backwards.
Amount that Risa had after giving to Jean on Friday
= 70 - 1 p
= 70 - 10
= $60
5 u = 60
1 u = 60 ÷ 5 = 12
Amount that Risa had at first
= 6 u
= 6 x 12
= $72
Total amount that Risa and Jean had
= 70 + 30
= $100
Amount that Jean had at first
= 100 - 72
= $28
Amount that Risa had more than Jean
= 72 - 28
= $44
Answer(s): $44
