Sam had some pastries.
27 of them were muffins. The rest were wafers. He sold
34 of the muffins and 4 wafers. In the end, he had 73 pastries left. How many pastries did he sell?
| |
Muffins |
Wafers |
Comparing pastries
at first |
2x2 =
4 u |
5x2 =
10 u |
Before
|
4x1 =
4 u |
10 u |
Change
|
- 3x1 =
- 3 u |
- 4 |
After
|
1x1 =
1 u |
10 u - 4 |
The number of muffins at first is repeated. Make the number of muffins at first the same. LCM of 2 and 4 is 4.
Total number of pastries left
= 1 u + 10 u - 4
= 11 u - 4
11 u - 4 = 73
11 u = 73 + 4
11 u = 77
1 u = 77 ÷ 11 = 7
Number of pastries that Sam sold
= 3 u + 4
= 3 x 7 + 4
= 21 + 4
= 25
Answer(s): 25
