Xavier had some pastries.
37 of them were wafers. The rest were cookies. He sold
25 of the wafers and 4 cookies. In the end, he had 83 pastries left. How many pastries did he sell?
| |
Wafers |
Cookies |
Comparing pastries
at first |
3x5 =
15 u |
4x5 =
20 u |
Before
|
5x3 =
15 u |
20 u |
Change
|
- 2x3 =
- 6 u |
- 4 |
After
|
3x3 =
9 u |
20 u - 4 |
The number of wafers at first is repeated. Make the number of wafers at first the same. LCM of 3 and 5 is 15.
Total number of pastries left
= 9 u + 20 u - 4
= 29 u - 4
29 u - 4 = 83
29 u = 83 + 4
29 u = 87
1 u = 87 ÷ 29 = 3
Number of pastries that Xavier sold
= 6 u + 4
= 6 x 3 + 4
= 18 + 4
= 22
Answer(s): 22
