PSLEIrene made some puffs to sell.
34 of them were chocolate puffs and the rest were egg puffs. After selling 100 egg puffs and
56 of the chocolate puffs, she had
16 of the puffs left. How many puffs did Irene sell?
|
Chocolate puffs |
Egg puffs |
Total |
Comparing chocolate puffs and egg puffs at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 100 |
|
After |
1x1
|
|
|
|
Chocolate puffs |
Egg puffs |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 100 |
|
After
|
1 u
|
2 u - 100
|
16 x 8 u = 113 u |
The number of chocolate puffs at first is repeated. Make the number of chocolate puffs at first the same. LCM of 3 and 6 is 6.
Number of puffs left
= 1 u + 2 u - 100
= 3 u - 100
3 u - 100 = 1
13 u
3 u - 1
13 u = 100
1
23 u = 100
1 u = 100 ÷ 1
23 = 60
Total number of puffs that Irene sold
= 5 u + 100
= 5 x 60 + 100
= 300 + 100
= 400
Answer(s): 400