Bobby had some pastries.
25 of them were muffins. The rest were macarons. He sold
25 of the muffins and 12 macarons. In the end, he had 135 pastries left. How many pastries did he sell?
| |
Muffins |
Macarons |
Comparing pastries
at first |
2x5 =
10 u |
3x5 =
15 u |
Before
|
5x2 =
10 u |
15 u |
Change
|
- 2x2 =
- 4 u |
- 12 |
After
|
3x2 =
6 u |
15 u - 12 |
The number of muffins at first is repeated. Make the number of muffins at first the same. LCM of 2 and 5 is 10.
Total number of pastries left
= 6 u + 15 u - 12
= 21 u - 12
21 u - 12 = 135
21 u = 135 + 12
21 u = 147
1 u = 147 ÷ 21 = 7
Number of pastries that Bobby sold
= 4 u + 12
= 4 x 7 + 12
= 28 + 12
= 40
Answer(s): 40
