in fred's catering order 5/12 of the lunches are sandwiches 2/12 are salads and 4/12 are pastas. Which equation can be used to find c, the fraction of the catering order that is sandwiches or salads?A c=5/12 + 4/12B c= 5/12 + 2/12C c= 2/12 + 4/12D c = 5/12 + 2/12 + 4/12