Irene baked a total of 481 croissants and tarts. After giving away 90% of the tarts and 80% of the croissants, she was left with thrice as many tarts as croissants. Find the number of croissants Irene gave away.
| |
Tarts |
Croissants |
| Before |
10x3 =
30 u
|
5 u |
| Change |
- 9x3 =
27 u |
- 4 u |
| After |
1x3 =
3 u |
1 u |
Comparing tarts and
croissants in the end |
3x1 =
3 u |
1x1 =
1 u |
90% =
90100 =
91080% =
80100 =
45The number of tarts in the end is the repeated identity. Make the number of tarts in the end the same. LCM of 1 and 3 is 3.
Total number of pastries at first
= 30 u + 5 u
= 35 u
35 u = 481
1 u = 481 ÷ 35 = 11
Number of croissants that Irene gave away
= 4 u
= 4 x 11
= 44
Answer(s): 44
