Aunt Jade made 100 more cookies than wafers. After she gave 0.7 of the cookies and
25 of the wafers to Barbara, she was left with 111 more cookies than wafers. How many cookies did she make?
| |
Cookies |
Wafers |
Comparing cookies
and wafers at first |
|
100 more |
Before |
10 u |
5x2 + 100 =
10 u + 100 |
Change |
- 7 u |
- 2x2 - 40 =
- 4 u - 40
|
After |
3 u |
3x2 + 60 =
6 u + 60 |
Comparing cookies
and wafers in the end |
|
111 more |
0.7 =
710 25 x 100 = 40
Number of wafers that Aunt Jade gave to Barbara = 4 u + 40
If Aunt Jade made another 111 cookies in the end, the number of cookies and wafers in the end would be the same.
6 u + 60 = 3 u + 111
6 u - 3 u = 111 - 60
3 u = 51
1 u = 51 ÷ 3 = 17
Number of cookies that Aunt Jade made
= 10 u
= 10 x 17
= 170
Answer(s): 170
