Daniel had some pastries.
27 of them were cookies. The rest were biscuits. He sold
25 of the cookies and 14 biscuits. In the end, he had 172 pastries left. How many pastries did he sell?
| |
Cookies |
Biscuits |
Comparing pastries
at first |
2x5 =
10 u |
5x5 =
25 u |
Before
|
5x2 =
10 u |
25 u |
Change
|
- 2x2 =
- 4 u |
- 14 |
After
|
3x2 =
6 u |
25 u - 14 |
The number of cookies at first is repeated. Make the number of cookies at first the same. LCM of 2 and 5 is 10.
Total number of pastries left
= 6 u + 25 u - 14
= 31 u - 14
31 u - 14 = 172
31 u = 172 + 14
31 u = 186
1 u = 186 ÷ 31 = 6
Number of pastries that Daniel sold
= 4 u + 14
= 4 x 6 + 14
= 24 + 14
= 38
Answer(s): 38
