Question 408604
Note that the total bill is an integer amount. If we assume that c is the number of people who order a chicken dinner, we can say that c, 2c, 3c, 4c, nor 6c do not give us integer values for the total bill. Therefore there must have been five people who ordered the chicken bill. Checking,


5(14.80) + 17 = 74 + 17 = 91.