Owen had some pastries.
25 of them were croissants. The rest were wafers. He sold
34 of the croissants and 7 wafers. In the end, he had 42 pastries left. How many pastries did he sell?
| |
Croissants |
Wafers |
Comparing pastries
at first |
2x2 =
4 u |
3x2 =
6 u |
Before
|
4x1 =
4 u |
6 u |
Change
|
- 3x1 =
- 3 u |
- 7 |
After
|
1x1 =
1 u |
6 u - 7 |
The number of croissants at first is repeated. Make the number of croissants at first the same. LCM of 2 and 4 is 4.
Total number of pastries left
= 1 u + 6 u - 7
= 7 u - 7
7 u - 7 = 42
7 u = 42 + 7
7 u = 49
1 u = 49 ÷ 7 = 7
Number of pastries that Owen sold
= 3 u + 7
= 3 x 7 + 7
= 21 + 7
= 28
Answer(s): 28
