PSLEFiona made some croissants to sell.
34 of them were lotus paste croissants and the rest were sardine croissants. After selling 390 sardine croissants and
56 of the lotus paste croissants, she had
16 of the croissants left. How many croissants did Fiona sell?
|
Lotus paste croissants |
Sardine croissants |
Total |
Comparing lotus paste croissants and sardine croissants at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 390 |
|
After |
1x1
|
|
|
|
Lotus paste croissants |
Sardine croissants |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 390 |
|
After
|
1 u
|
2 u - 390
|
16 x 8 u = 113 u |
The number of lotus paste croissants at first is repeated. Make the number of lotus paste croissants at first the same. LCM of 3 and 6 is 6.
Number of croissants left
= 1 u + 2 u - 390
= 3 u - 390
3 u - 390 = 1
13 u
3 u - 1
13 u = 390
1
23 u = 390
1 u = 390 ÷ 1
23 = 234
Total number of croissants that Fiona sold
= 5 u + 390
= 5 x 234 + 390
= 1170 + 390
= 1560
Answer(s): 1560