Seth had some pastries.
58 of them were cookies. The rest were macarons. He sold
56 of the cookies and 3 macarons. In the end, he had 66 pastries left. How many pastries did he sell?
| |
Cookies |
Macarons |
Comparing pastries
at first |
5x6 =
30 u |
3x6 =
18 u |
Before
|
6x5 =
30 u |
18 u |
Change
|
- 5x5 =
- 25 u |
- 3 |
After
|
1x5 =
5 u |
18 u - 3 |
The number of cookies at first is repeated. Make the number of cookies at first the same. LCM of 5 and 6 is 30.
Total number of pastries left
= 5 u + 18 u - 3
= 23 u - 3
23 u - 3 = 66
23 u = 66 + 3
23 u = 69
1 u = 69 ÷ 23 = 3
Number of pastries that Seth sold
= 25 u + 3
= 25 x 3 + 3
= 75 + 3
= 78
Answer(s): 78
