Howard had some pastries.
25 of them were wafers. The rest were scones. He sold
25 of the wafers and 17 scones. In the end, he had 67 pastries left. How many pastries did he sell?
| |
Wafers |
Scones |
Comparing pastries
at first |
2x5 =
10 u |
3x5 =
15 u |
Before
|
5x2 =
10 u |
15 u |
Change
|
- 2x2 =
- 4 u |
- 17 |
After
|
3x2 =
6 u |
15 u - 17 |
The number of wafers at first is repeated. Make the number of wafers at first the same. LCM of 2 and 5 is 10.
Total number of pastries left
= 6 u + 15 u - 17
= 21 u - 17
21 u - 17 = 67
21 u = 67 + 17
21 u = 84
1 u = 84 ÷ 21 = 4
Number of pastries that Howard sold
= 4 u + 17
= 4 x 4 + 17
= 16 + 17
= 33
Answer(s): 33
