PSLEKylie made some sandwiches to sell.
34 of them were sardine sandwiches and the rest were lotus paste sandwiches. After selling 210 lotus paste sandwiches and
56 of the sardine sandwiches, she had
15 of the sandwiches left. How many sandwiches did Kylie sell?
|
Sardine sandwiches |
Lotus paste sandwiches |
Total |
Comparing sardine sandwiches and lotus paste sandwiches at first |
3x2 |
1x2 |
4x2
|
Before |
6x1 |
|
|
Change |
- 5x1
|
- 210 |
|
After |
1x1
|
|
|
|
Sardine sandwiches |
Lotus paste sandwiches |
Total |
Before |
6 u |
2 u |
8 u
|
Change |
- 5 u
|
- 210 |
|
After
|
1 u
|
2 u - 210
|
15 x 8 u = 135 u |
The number of sardine sandwiches at first is repeated. Make the number of sardine sandwiches at first the same. LCM of 3 and 6 is 6.
Number of sandwiches left
= 1 u + 2 u - 210
= 3 u - 210
3 u - 210 = 1
35 u
3 u - 1
35 u = 210
1
25 u = 210
1 u = 210 ÷ 1
25 = 150
Total number of sandwiches that Kylie sold
= 5 u + 210
= 5 x 150 + 210
= 750 + 210
= 960
Answer(s): 960