Harry had some pastries.
37 of them were croissants. The rest were cookies. He sold
34 of the croissants and 9 cookies. In the end, he had 143 pastries left. How many pastries did he sell?
| |
Croissants |
Cookies |
Comparing pastries
at first |
3x4 =
12 u |
4x4 =
16 u |
Before
|
4x3 =
12 u |
16 u |
Change
|
- 3x3 =
- 9 u |
- 9 |
After
|
1x3 =
3 u |
16 u - 9 |
The number of croissants at first is repeated. Make the number of croissants at first the same. LCM of 3 and 4 is 12.
Total number of pastries left
= 3 u + 16 u - 9
= 19 u - 9
19 u - 9 = 143
19 u = 143 + 9
19 u = 152
1 u = 152 ÷ 19 = 8
Number of pastries that Harry sold
= 9 u + 9
= 9 x 8 + 9
= 72 + 9
= 81
Answer(s): 81
