The ratio of the amount of money Shiyun had to the amount of money Dana had was 6 : 7. Shiyun then gave
56 of her money to Dana. In the end, Dana returned $66 to Shiyun and they both had the same amount of money. How much money did each girl have at the beginning?
- Dana
- Shiyun
|
Shiyun |
Dana |
Total |
Before |
6 u |
7 u |
13 u |
Change 1 |
- 5 u |
+ 5 u |
|
After 1 |
1 u |
12 u |
13 u |
Change 2 |
+ 66 |
- 66 |
|
After 2 |
1 u + 66 |
12 u - 66 |
|
Amount that Shiyun and Dana each had in the end is the same.
12 u - 66 = 1 u + 66
12 u - 1 u = 66 + 66
11 u = 132
1 u = 132 ÷ 11 = 12
Amount that Shiyun had at first
= 6 u
= 6 x 12
= $72
(b)
Amount that Dana had at first
= 7 u
= 7 x 12
= $84
Answer(s): (a) $72; (b) $84