PSLEMary made some puffs to sell.
34 of them were egg puffs and the rest were sardine puffs. After selling 390 sardine puffs and
56 of the egg puffs, she had
16 of the puffs left. How many puffs did Mary sell?
|
Egg puffs |
Sardine puffs |
Total |
Comparing egg puffs and sardine puffs at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 390 |
|
After |
1x1
|
|
|
|
Egg puffs |
Sardine puffs |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 390 |
|
After
|
1 u
|
2 u - 390
|
16 x 8 u = 113 u |
The number of egg puffs at first is repeated. Make the number of egg puffs at first the same. LCM of 3 and 6 is 6.
Number of puffs left
= 1 u + 2 u - 390
= 3 u - 390
3 u - 390 = 1
13 u
3 u - 1
13 u = 390
1
23 u = 390
1 u = 390 ÷ 1
23 = 234
Total number of puffs that Mary sold
= 5 u + 390
= 5 x 234 + 390
= 1170 + 390
= 1560
Answer(s): 1560