PSLECathy made some puffs to sell.
34 of them were beef puffs and the rest were curry puffs. After selling 315 curry puffs and
56 of the beef puffs, she had
15 of the puffs left. How many puffs did Cathy sell?
|
Beef puffs |
Curry puffs |
Total |
Comparing beef puffs and curry puffs at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 315 |
|
After |
1x1
|
|
|
|
Beef puffs |
Curry puffs |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 315 |
|
After
|
1 u
|
2 u - 315
|
15 x 8 u = 135 u |
The number of beef puffs at first is repeated. Make the number of beef puffs at first the same. LCM of 3 and 6 is 6.
Number of puffs left
= 1 u + 2 u - 315
= 3 u - 315
3 u - 315 = 1
35 u
3 u - 1
35 u = 315
1
25 u = 315
1 u = 315 ÷ 1
25 = 225
Total number of puffs that Cathy sold
= 5 u + 315
= 5 x 225 + 315
= 1125 + 315
= 1440
Answer(s): 1440