Ben had some pastries.
38 of them were cookies. The rest were croissants. He sold
35 of the cookies and 5 croissants. In the end, he had 150 pastries left. How many pastries did he sell?
| |
Cookies |
Croissants |
Comparing pastries
at first |
3x5 =
15 u |
5x5 =
25 u |
Before
|
5x3 =
15 u |
25 u |
Change
|
- 3x3 =
- 9 u |
- 5 |
After
|
2x3 =
6 u |
25 u - 5 |
The number of cookies at first is repeated. Make the number of cookies at first the same. LCM of 3 and 5 is 15.
Total number of pastries left
= 6 u + 25 u - 5
= 31 u - 5
31 u - 5 = 150
31 u = 150 + 5
31 u = 155
1 u = 155 ÷ 31 = 5
Number of pastries that Ben sold
= 9 u + 5
= 9 x 5 + 5
= 45 + 5
= 50
Answer(s): 50
