Reggie had some pastries.
37 of them were puffs. The rest were cookies. He sold
25 of the puffs and 3 cookies. In the end, he had 142 pastries left. How many pastries did he sell?
| |
Puffs |
Cookies |
Comparing pastries
at first |
3x5 =
15 u |
4x5 =
20 u |
Before
|
5x3 =
15 u |
20 u |
Change
|
- 2x3 =
- 6 u |
- 3 |
After
|
3x3 =
9 u |
20 u - 3 |
The number of puffs at first is repeated. Make the number of puffs at first the same. LCM of 3 and 5 is 15.
Total number of pastries left
= 9 u + 20 u - 3
= 29 u - 3
29 u - 3 = 142
29 u = 142 + 3
29 u = 145
1 u = 145 ÷ 29 = 5
Number of pastries that Reggie sold
= 6 u + 3
= 6 x 5 + 3
= 30 + 3
= 33
Answer(s): 33
