Min baked a total of 447 wafers and cookies. After giving away 90% of the cookies and 80% of the wafers, she was left with four times as many cookies as wafers. Find the number of wafers Min gave away.
| |
Cookies |
Wafers |
| Before |
10x4 =
40 u
|
5 u |
| Change |
- 9x4 =
36 u |
- 4 u |
| After |
1x4 =
4 u |
1 u |
Comparing cookies and
wafers in the end |
4x1 =
4 u |
1x1 =
1 u |
90% =
90100 =
91080% =
80100 =
45The number of cookies in the end is the repeated identity. Make the number of cookies in the end the same. LCM of 1 and 4 is 4.
Total number of pastries at first
= 40 u + 5 u
= 45 u
45 u = 447
1 u = 447 ÷ 45 = 12
Number of wafers that Min gave away
= 4 u
= 4 x 12
= 48
Answer(s): 48
