Henry had some pastries.
25 of them were cookies. The rest were biscuits. He sold
34 of the cookies and 12 biscuits. In the end, he had 30 pastries left. How many pastries did he sell?
| |
Cookies |
Biscuits |
Comparing pastries
at first |
2x2 =
4 u |
3x2 =
6 u |
Before
|
4x1 =
4 u |
6 u |
Change
|
- 3x1 =
- 3 u |
- 12 |
After
|
1x1 =
1 u |
6 u - 12 |
The number of cookies at first is repeated. Make the number of cookies at first the same. LCM of 2 and 4 is 4.
Total number of pastries left
= 1 u + 6 u - 12
= 7 u - 12
7 u - 12 = 30
7 u = 30 + 12
7 u = 42
1 u = 42 ÷ 7 = 6
Number of pastries that Henry sold
= 3 u + 12
= 3 x 6 + 12
= 18 + 12
= 30
Answer(s): 30
