Risa baked a total of 364 biscuits and croissants. After giving away 80% of the croissants and 75% of the biscuits, she was left with four times as many croissants as biscuits. Find the number of biscuits Risa gave away.
| |
Croissants |
Biscuits |
| Before |
5x4 =
20 u
|
4 u |
| Change |
- 4x4 =
16 u |
- 3 u |
| After |
1x4 =
4 u |
1 u |
Comparing croissants and
biscuits in the end |
4x1 =
4 u |
1x1 =
1 u |
80% =
80100 =
4575% =
75100 =
34The 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
= 20 u + 4 u
= 24 u
24 u = 364
1 u = 364 ÷ 24 = 11
Number of biscuits that Risa gave away
= 3 u
= 3 x 11
= 33
Answer(s): 33
