Ian has 12.2 ounce bottle of ketchup. he uses 1/20 of the ketchup every time he has a buffalo burger. how many ounces of ketchup are left after ian has eaten 4 buffalo burgers.

9.76 ounces

Step-by-step explanation:

Ian has 12.2 ounce bottle of ketchup.

He uses of the ketchup every time he has a buffalo burger.

× 12.2

= 0.61 ounces every time

He has eaten 4 buffalo burgers. So he used ketchup = 0.61 × 4

                                                                                        = 2.44 ounces

Now the amount of ketchup are left = 12.2 - 2.44

                                                           = 9.76 ounces

9.76 ounces of ketchup are left after Ian has eaten 4 buffalo burgers.