Rael had some pastries.
38 of them were macarons. The rest were cookies. He sold
35 of the macarons and 13 cookies. In the end, he had 173 pastries left. How many pastries did he sell?
| |
Macarons |
Cookies |
Comparing pastries
at first |
3x5 =
15 u |
5x5 =
25 u |
Before
|
5x3 =
15 u |
25 u |
Change
|
- 3x3 =
- 9 u |
- 13 |
After
|
2x3 =
6 u |
25 u - 13 |
The number of macarons at first is repeated. Make the number of macarons at first the same. LCM of 3 and 5 is 15.
Total number of pastries left
= 6 u + 25 u - 13
= 31 u - 13
31 u - 13 = 173
31 u = 173 + 13
31 u = 186
1 u = 186 ÷ 31 = 6
Number of pastries that Rael sold
= 9 u + 13
= 9 x 6 + 13
= 54 + 13
= 67
Answer(s): 67
