Gabriel had some pastries.
58 of them were tarts. The rest were wafers. He sold
34 of the tarts and 12 wafers. In the end, he had 39 pastries left. How many pastries did he sell?
| |
Tarts |
Wafers |
Comparing pastries
at first |
5x4 =
20 u |
3x4 =
12 u |
Before
|
4x5 =
20 u |
12 u |
Change
|
- 3x5 =
- 15 u |
- 12 |
After
|
1x5 =
5 u |
12 u - 12 |
The number of tarts at first is repeated. Make the number of tarts at first the same. LCM of 5 and 4 is 20.
Total number of pastries left
= 5 u + 12 u - 12
= 17 u - 12
17 u - 12 = 39
17 u = 39 + 12
17 u = 51
1 u = 51 ÷ 17 = 3
Number of pastries that Gabriel sold
= 15 u + 12
= 15 x 3 + 12
= 45 + 12
= 57
Answer(s): 57
