Yen baked a total of 437 croissants and shortbreads. After giving away 80% of the shortbreads and 90% of the croissants, she was left with four times as many shortbreads as croissants. Find the number of croissants Yen gave away.
| |
Shortbreads |
Croissants |
| Before |
5x4 =
20 u
|
10 u |
| Change |
- 4x4 =
16 u |
- 9 u |
| After |
1x4 =
4 u |
1 u |
Comparing shortbreads and
croissants in the end |
4x1 =
4 u |
1x1 =
1 u |
80% =
80100 =
4590% =
90100 =
910The number of shortbreads in the end is the repeated identity. Make the number of shortbreads in the end the same. LCM of 1 and 4 is 4.
Total number of pastries at first
= 20 u + 10 u
= 30 u
30 u = 437
1 u = 437 ÷ 30 = 12
Number of croissants that Yen gave away
= 9 u
= 9 x 12
= 108
Answer(s): 108
