Nick had some pastries.
38 of them were scones. The rest were biscuits. He sold
25 of the scones and 20 biscuits. In the end, he had 82 pastries left. How many pastries did he sell?
| |
Scones |
Biscuits |
Comparing pastries
at first |
3x5 =
15 u |
5x5 =
25 u |
Before
|
5x3 =
15 u |
25 u |
Change
|
- 2x3 =
- 6 u |
- 20 |
After
|
3x3 =
9 u |
25 u - 20 |
The number of scones at first is repeated. Make the number of scones at first the same. LCM of 3 and 5 is 15.
Total number of pastries left
= 9 u + 25 u - 20
= 34 u - 20
34 u - 20 = 82
34 u = 82 + 20
34 u = 102
1 u = 102 ÷ 34 = 3
Number of pastries that Nick sold
= 6 u + 20
= 6 x 3 + 20
= 18 + 20
= 38
Answer(s): 38
