A convenience store sold ham, bacon and egg mayo sandwiches. The ratio of the number of ham sandwiches made to the total number of sandwiches made was 4 : 7. The ratio of the number of bacon sandwiches made to the total number of sandwiches made was 1 : 6. After the store sold some ham sandwiches and made another 10 bacon sandwiches, there was an equal number of ham, bacon and egg mayo sandwiches left. Find the number of ham sandwiches sold.
|
Ham |
Bacon |
Egg Mayo |
Total |
Comparing ham to total |
4x6 |
|
|
7x6 |
Comparing bacon to total |
|
1x7 |
|
6x7 |
|
24 u |
7 u |
11 u |
42 u |
|
Ham |
Bacon |
Egg Mayo |
Total |
Before |
24 u |
7 u |
11 u |
42 u |
Change |
- 13 u |
+ 10 |
No change |
|
After |
1x11 = 11 u |
1x11 = 11 u |
1x11 = 11 u |
|
The total number of sandwiches is the same at first. Make the total number of sandwiches the same. LCM of 6 and 7 is 42.
Number of egg mayo sandwiches remains the same at first and in the end. Make the number of egg mayo sandwiches the same. LCM of 1 and 11 is 11.
Number of egg mayo sandwiches
= 42 u - 24 u - 7 u
= 11 u
Number of ham, bacon and egg mayo sandwiches is the same in the end.
Number of bacon sandwiches = 7 u + 10
7 u + 10 = 11 u
11 u - 7 u = 10
4 u = 10
1 u = 10 ÷ 4 = 7
Number of ham sandwiches sold
= 24 u - 11 u
= 13 u
= 13 x 7
= 91
Answer(s): 91