Xavier had some pastries.
27 of them were cookies. The rest were wafers. He sold
25 of the cookies and 5 wafers. In the end, he had 150 pastries left. How many more cookies than wafers did he sell?
| |
Cookies |
Wafers |
Comparing pastries
at first |
2x5 =
10 u |
5x5 =
25 u |
Before
|
5x2 =
10 u |
25 u |
Change
|
- 2x2 =
- 4 u |
- 5 |
After
|
3x2 =
6 u |
25 u - 5 |
The number of cookies at first is repeated. Make the number of cookies at first the same. LCM of 2 and 5 is 10.
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 more cookies than wafers that Xavier sold
= 4 u - 5
= 4 x 5 - 5
= 20 - 5
= 15
Answer(s): 15
