PSLETiffany made some croissants to sell.
34 of them were chocolate croissants and the rest were sardine croissants. After selling 140 sardine croissants and
56 of the chocolate croissants, she had
15 of the croissants left. How many croissants did Tiffany sell?
|
Chocolate croissants |
Sardine croissants |
Total |
Comparing chocolate croissants and sardine croissants at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 140 |
|
After |
1x1
|
|
|
|
Chocolate croissants |
Sardine croissants |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 140 |
|
After
|
1 u
|
2 u - 140
|
15 x 8 u = 135 u |
The number of chocolate croissants at first is repeated. Make the number of chocolate croissants at first the same. LCM of 3 and 6 is 6.
Number of croissants left
= 1 u + 2 u - 140
= 3 u - 140
3 u - 140 = 1
35 u
3 u - 1
35 u = 140
1
25 u = 140
1 u = 140 ÷ 1
25 = 100
Total number of croissants that Tiffany sold
= 5 u + 140
= 5 x 100 + 140
= 500 + 140
= 640
Answer(s): 640