Ken had some pastries.
47 of them were wafers. The rest were macarons. He sold
35 of the wafers and 19 macarons. In the end, he had 50 pastries left. How many pastries did he sell?
| |
Wafers |
Macarons |
Comparing pastries
at first |
4x5 =
20 u |
3x5 =
15 u |
Before
|
5x4 =
20 u |
15 u |
Change
|
- 3x4 =
- 12 u |
- 19 |
After
|
2x4 =
8 u |
15 u - 19 |
The number of wafers at first is repeated. Make the number of wafers at first the same. LCM of 4 and 5 is 20.
Total number of pastries left
= 8 u + 15 u - 19
= 23 u - 19
23 u - 19 = 50
23 u = 50 + 19
23 u = 69
1 u = 69 ÷ 23 = 3
Number of pastries that Ken sold
= 12 u + 19
= 12 x 3 + 19
= 36 + 19
= 55
Answer(s): 55
