Aunt Tammy made 50 less shortbreads than wafers. After she gave 0.9 of the shortbreads and
25 of the wafers to Betty, she was left with 90 less shortbreads than wafers. How many wafers did she make?
| |
Shortbreads |
Wafers |
Comparing shortbreads
and wafers at first |
|
50 more |
Before |
10 u |
5x2 + 50 =
10 u + 50 |
Change |
- 9 u |
- 2x2 - 20 =
- 4 u - 20
|
After |
1 u |
3x2 + 30 =
6 u + 30 |
Comparing shortbreads
and wafers in the end |
|
90 more |
0.9 =
910 25 x 50 = 20
Number of wafers that Aunt Tammy gave to Betty = 4 u + 20
If Aunt Tammy made another 90 shortbreads in the end, the number of shortbreads and wafers in the end would be the same.
6 u + 30 = 1 u + 90
6 u - 1 u = 90 - 30
5 u = 60
1 u = 60 ÷ 5 = 12
Number of wafers that Aunt Tammy made
= 10 u + 50
= 10 x 12 + 50
= 120 + 50
= 170
Answer(s): 170
