Sean had some pastries.
35 of them were cookies. The rest were tarts. He sold
25 of the cookies and 13 tarts. In the end, he had 82 pastries left. How many more cookies than tarts did he sell?
| |
Cookies |
Tarts |
Comparing pastries
at first |
3x5 =
15 u |
2x5 =
10 u |
Before
|
5x3 =
15 u |
10 u |
Change
|
- 2x3 =
- 6 u |
- 13 |
After
|
3x3 =
9 u |
10 u - 13 |
The number of cookies at first is repeated. Make the number of cookies at first the same. LCM of 3 and 5 is 15.
Total number of pastries left
= 9 u + 10 u - 13
= 19 u - 13
19 u - 13 = 82
19 u = 82 + 13
19 u = 95
1 u = 95 ÷ 19 = 5
Number of more cookies than tarts that Sean sold
= 6 u - 13
= 6 x 5 - 13
= 30 - 13
= 17
Answer(s): 17
