Emily baked a total of 491 croissants and tarts. After giving away 80% of the tarts and 90% of the croissants, she was left with four times as many tarts as croissants. Find the number of croissants Emily gave away.
| |
Tarts |
Croissants |
| Before |
5x4 =
20 u
|
10 u |
| Change |
- 4x4 =
16 u |
- 9 u |
| After |
1x4 =
4 u |
1 u |
Comparing tarts and
croissants in the end |
4x1 =
4 u |
1x1 =
1 u |
80% =
80100 =
4590% =
90100 =
910The number of tarts in the end is the repeated identity. Make the number of tarts 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 = 491
1 u = 491 ÷ 30 = 9
Number of croissants that Emily gave away
= 9 u
= 9 x 9
= 81
Answer(s): 81
