Cody had some pastries.
25 of them were scones. The rest were biscuits. He sold
35 of the scones and 18 biscuits. In the end, he had 115 pastries left. How many pastries did he sell?
| |
Scones |
Biscuits |
Comparing pastries
at first |
2x5 =
10 u |
3x5 =
15 u |
Before
|
5x2 =
10 u |
15 u |
Change
|
- 3x2 =
- 6 u |
- 18 |
After
|
2x2 =
4 u |
15 u - 18 |
The number of scones at first is repeated. Make the number of scones at first the same. LCM of 2 and 5 is 10.
Total number of pastries left
= 4 u + 15 u - 18
= 19 u - 18
19 u - 18 = 115
19 u = 115 + 18
19 u = 133
1 u = 133 ÷ 19 = 7
Number of pastries that Cody sold
= 6 u + 18
= 6 x 7 + 18
= 42 + 18
= 60
Answer(s): 60
