Rael had some pastries.
35 of them were puffs. The rest were biscuits. He sold
35 of the puffs and 20 biscuits. In the end, he had 124 pastries left. How many more puffs than biscuits did he sell?
| |
Puffs |
Biscuits |
Comparing pastries
at first |
3x5 =
15 u |
2x5 =
10 u |
Before
|
5x3 =
15 u |
10 u |
Change
|
- 3x3 =
- 9 u |
- 20 |
After
|
2x3 =
6 u |
10 u - 20 |
The number of puffs at first is repeated. Make the number of puffs at first the same. LCM of 3 and 5 is 15.
Total number of pastries left
= 6 u + 10 u - 20
= 16 u - 20
16 u - 20 = 124
16 u = 124 + 20
16 u = 144
1 u = 144 ÷ 16 = 9
Number of more puffs than biscuits that Rael sold
= 9 u - 20
= 9 x 9 - 20
= 81 - 20
= 61
Answer(s): 61
