Aunt Shiyun made 80 less cookies than tarts. After she gave 0.7 of the cookies and
25 of the tarts to Xandra, she was left with 63 less cookies than tarts. How many tarts did she make?
| |
Cookies |
Tarts |
Comparing cookies
and tarts at first |
|
80 more |
Before |
10 u |
5x2 + 80 =
10 u + 80 |
Change |
- 7 u |
- 2x2 - 32 =
- 4 u - 32
|
After |
3 u |
3x2 + 48 =
6 u + 48 |
Comparing cookies
and tarts in the end |
|
63 more |
0.7 =
710 25 x 80 = 32
Number of tarts that Aunt Shiyun gave to Xandra = 4 u + 32
If Aunt Shiyun made another 63 cookies in the end, the number of cookies and tarts in the end would be the same.
6 u + 48 = 3 u + 63
6 u - 3 u = 63 - 48
3 u = 15
1 u = 15 ÷ 3 = 5
Number of tarts that Aunt Shiyun made
= 10 u + 80
= 10 x 5 + 80
= 50 + 80
= 130
Answer(s): 130
