Lee had some pastries.
38 of them were cookies. The rest were wafers. He sold
34 of the cookies and 2 wafers. In the end, he had 67 pastries left. How many pastries did he sell?
| |
Cookies |
Wafers |
Comparing pastries
at first |
3x4 =
12 u |
5x4 =
20 u |
Before
|
4x3 =
12 u |
20 u |
Change
|
- 3x3 =
- 9 u |
- 2 |
After
|
1x3 =
3 u |
20 u - 2 |
The number of cookies at first is repeated. Make the number of cookies at first the same. LCM of 3 and 4 is 12.
Total number of pastries left
= 3 u + 20 u - 2
= 23 u - 2
23 u - 2 = 67
23 u = 67 + 2
23 u = 69
1 u = 69 ÷ 23 = 3
Number of pastries that Lee sold
= 9 u + 2
= 9 x 3 + 2
= 27 + 2
= 29
Answer(s): 29
