Roshel baked a total of 270 cookies and puffs. After giving away 80% of the puffs and 75% of the cookies, she was left with five times as many puffs as cookies. Find the number of cookies Roshel gave away.
| |
Puffs |
Cookies |
| Before |
5x5 =
25 u
|
4 u |
| Change |
- 4x5 =
20 u |
- 3 u |
| After |
1x5 =
5 u |
1 u |
Comparing puffs and
cookies in the end |
5x1 =
5 u |
1x1 =
1 u |
80% =
80100 =
4575% =
75100 =
34The number of puffs in the end is the repeated identity. Make the number of puffs in the end the same. LCM of 1 and 5 is 5.
Total number of pastries at first
= 25 u + 4 u
= 29 u
29 u = 270
1 u = 270 ÷ 29 = 6
Number of cookies that Roshel gave away
= 3 u
= 3 x 6
= 18
Answer(s): 18
