Final answer:
To find out what condiments the remaining cheeseburgers had, subtract the number of cheeseburgers with pickles and onions from the total, using the given fractions. The remaining cheeseburgers had Ketchup.
Step-by-step explanation:
To find out what condiments the remaining cheeseburgers had, we need to subtract the number of cheeseburgers with pickles and onions from the total number of cheeseburgers.
1/4 of the 240 cheeseburgers had pickles, which is 240 x 1/4 = 60 cheeseburgers with pickles. Now we have 240 - 60 = 180 cheeseburgers remaining.
1/2 of these remaining cheeseburgers had onions, which is 180 x 1/2 = 90 cheeseburgers with onions. So the rest of the cheeseburgers, 180 - 90 = 90, had Ketchup as the condiment.