Eric had some pastries.
25 of them were puffs. The rest were cookies. He sold
34 of the puffs and 2 cookies. In the end, he had 33 pastries left. How many pastries did he sell?
| |
Puffs |
Cookies |
Comparing pastries
at first |
2x2 =
4 u |
3x2 =
6 u |
Before
|
4x1 =
4 u |
6 u |
Change
|
- 3x1 =
- 3 u |
- 2 |
After
|
1x1 =
1 u |
6 u - 2 |
The number of puffs at first is repeated. Make the number of puffs at first the same. LCM of 2 and 4 is 4.
Total number of pastries left
= 1 u + 6 u - 2
= 7 u - 2
7 u - 2 = 33
7 u = 33 + 2
7 u = 35
1 u = 35 ÷ 7 = 5
Number of pastries that Eric sold
= 3 u + 2
= 3 x 5 + 2
= 15 + 2
= 17
Answer(s): 17
