Aunt Erika made 90 less cookies than croissants. After she gave 0.7 of the cookies and
25 of the croissants to Gem, she was left with 66 less cookies than croissants. How many croissants did she make?
| |
Cookies |
Croissants |
Comparing cookies
and croissants at first |
|
90 more |
Before |
10 u |
5x2 + 90 =
10 u + 90 |
Change |
- 7 u |
- 2x2 - 36 =
- 4 u - 36
|
After |
3 u |
3x2 + 54 =
6 u + 54 |
Comparing cookies
and croissants in the end |
|
66 more |
0.7 =
710 25 x 90 = 36
Number of croissants that Aunt Erika gave to Gem = 4 u + 36
If Aunt Erika made another 66 cookies in the end, the number of cookies and croissants in the end would be the same.
6 u + 54 = 3 u + 66
6 u - 3 u = 66 - 54
3 u = 12
1 u = 12 ÷ 3 = 4
Number of croissants that Aunt Erika made
= 10 u + 90
= 10 x 4 + 90
= 40 + 90
= 130
Answer(s): 130
