42 sandwiches were not tuna salad.
Step-by-step explanation:
Given,
Number of sandwiches sold = 56
Tuna salad sandwiches = 25%
No. of tuna salads = 25% of total sold
14 sandwiches were tuna salads, the remaining will not be, therefore;
Remaining sandwiches = Total sold - No. of tuna salads
Remaining sandwiches = 56 - 14 = 42
42 sandwiches were not tuna salad.
Keywords: percentage, subtraction
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