Sam had some pastries.
37 of them were cookies. The rest were wafers. He sold
34 of the cookies and 11 wafers. In the end, he had 160 pastries left. How many more cookies than wafers did he sell?
| |
Cookies |
Wafers |
Comparing pastries
at first |
3x4 =
12 u |
4x4 =
16 u |
Before
|
4x3 =
12 u |
16 u |
Change
|
- 3x3 =
- 9 u |
- 11 |
After
|
1x3 =
3 u |
16 u - 11 |
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 + 16 u - 11
= 19 u - 11
19 u - 11 = 160
19 u = 160 + 11
19 u = 171
1 u = 171 ÷ 19 = 9
Number of more cookies than wafers that Sam sold
= 9 u - 11
= 9 x 9 - 11
= 81 - 11
= 70
Answer(s): 70
