PSLEMary made some buns to sell.
34 of them were lotus paste buns and the rest were chocolate buns. After selling 125 chocolate buns and
56 of the lotus paste buns, she had
16 of the buns left. How many buns did Mary sell?
|
Lotus paste buns |
Chocolate buns |
Total |
Comparing lotus paste buns and chocolate buns at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 125 |
|
After |
1x1
|
|
|
|
Lotus paste buns |
Chocolate buns |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 125 |
|
After
|
1 u
|
2 u - 125
|
16 x 8 u = 113 u |
The number of lotus paste buns at first is repeated. Make the number of lotus paste buns at first the same. LCM of 3 and 6 is 6.
Number of buns left
= 1 u + 2 u - 125
= 3 u - 125
3 u - 125 = 1
13 u
3 u - 1
13 u = 125
1
23 u = 125
1 u = 125 ÷ 1
23 = 75
Total number of buns that Mary sold
= 5 u + 125
= 5 x 75 + 125
= 375 + 125
= 500
Answer(s): 500