PSLEXandra made some puffs to sell.
34 of them were curry puffs and the rest were beef puffs. After selling 400 beef puffs and
56 of the curry puffs, she had
16 of the puffs left. How many puffs did Xandra sell?
|
Curry puffs |
Beef puffs |
Total |
Comparing curry puffs and beef puffs at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 400 |
|
After |
1x1
|
|
|
|
Curry puffs |
Beef puffs |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 400 |
|
After
|
1 u
|
2 u - 400
|
16 x 8 u = 113 u |
The number of curry puffs at first is repeated. Make the number of curry puffs at first the same. LCM of 3 and 6 is 6.
Number of puffs left
= 1 u + 2 u - 400
= 3 u - 400
3 u - 400 = 1
13 u
3 u - 1
13 u = 400
1
23 u = 400
1 u = 400 ÷ 1
23 = 240
Total number of puffs that Xandra sold
= 5 u + 400
= 5 x 240 + 400
= 1200 + 400
= 1600
Answer(s): 1600