Aunt Erika made 80 more cookies than wafers. After she gave 0.9 of the cookies and
35 of the wafers to Vanessa, she was left with 47 more cookies than wafers. How many cookies did she make?
| |
Cookies |
Wafers |
Comparing cookies
and wafers at first |
|
80 more |
Before |
10 u |
5x2 + 80 =
10 u + 80 |
Change |
- 9 u |
- 3x2 - 48 =
- 6 u - 48
|
After |
1 u |
2x2 + 32 =
4 u + 32 |
Comparing cookies
and wafers in the end |
|
47 more |
0.9 =
910 35 x 80 = 48
Number of wafers that Aunt Erika gave to Vanessa = 6 u + 48
If Aunt Erika made another 47 cookies in the end, the number of cookies and wafers in the end would be the same.
4 u + 32 = 1 u + 47
4 u - 1 u = 47 - 32
3 u = 15
1 u = 15 ÷ 3 = 5
Number of cookies that Aunt Erika made
= 10 u
= 10 x 5
= 50
Answer(s): 50
