PSLERisa made some muffins to sell.
34 of them were sardine muffins and the rest were chicken muffins. After selling 210 chicken muffins and
56 of the sardine muffins, she had
16 of the muffins left. How many muffins did Risa sell?
|
Sardine muffins |
Chicken muffins |
Total |
Comparing sardine muffins and chicken muffins at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 210 |
|
After |
1x1
|
|
|
|
Sardine muffins |
Chicken muffins |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 210 |
|
After
|
1 u
|
2 u - 210
|
16 x 8 u = 113 u |
The number of sardine muffins at first is repeated. Make the number of sardine muffins at first the same. LCM of 3 and 6 is 6.
Number of muffins left
= 1 u + 2 u - 210
= 3 u - 210
3 u - 210 = 1
13 u
3 u - 1
13 u = 210
1
23 u = 210
1 u = 210 ÷ 1
23 = 126
Total number of muffins that Risa sold
= 5 u + 210
= 5 x 126 + 210
= 630 + 210
= 840
Answer(s): 840