Cindy baked a total of 391 cookies and croissants. After giving away 75% of the croissants and 80% of the cookies, she was left with four times as many croissants as cookies. Find the number of cookies Cindy gave away.
| |
Croissants |
Cookies |
| Before |
4x4 =
16 u
|
5 u |
| Change |
- 3x4 =
12 u |
- 4 u |
| After |
1x4 =
4 u |
1 u |
Comparing croissants and
cookies in the end |
4x1 =
4 u |
1x1 =
1 u |
75% =
75100 =
3480% =
80100 =
45The number of croissants in the end is the repeated identity. Make the number of croissants in the end the same. LCM of 1 and 4 is 4.
Total number of pastries at first
= 16 u + 5 u
= 21 u
21 u = 391
1 u = 391 ÷ 21 = 12
Number of cookies that Cindy gave away
= 4 u
= 4 x 12
= 48
Answer(s): 48
