David had some pastries.
25 of them were puffs. The rest were macarons. He sold
34 of the puffs and 11 macarons. In the end, he had 38 pastries left. How many more puffs than macarons did he sell?
| |
Puffs |
Macarons |
Comparing pastries
at first |
2x2 =
4 u |
3x2 =
6 u |
Before
|
4x1 =
4 u |
6 u |
Change
|
- 3x1 =
- 3 u |
- 11 |
After
|
1x1 =
1 u |
6 u - 11 |
The number of puffs at first is repeated. Make the number of puffs at first the same. LCM of 2 and 4 is 4.
Total number of pastries left
= 1 u + 6 u - 11
= 7 u - 11
7 u - 11 = 38
7 u = 38 + 11
7 u = 49
1 u = 49 ÷ 7 = 7
Number of more puffs than macarons that David sold
= 3 u - 11
= 3 x 7 - 11
= 21 - 11
= 10
Answer(s): 10
