Come up with a question and reasoning that would justify this answer: 420
Question and rationale: The question is: A tiger shark has 180 teeth. A hammerhead shark has 1/6 the number of teeth that a tiger shark has. A great white shark has double the sum of teeth of a tiger shark and a hammerhead shark. How many teeth does a great white shark have?
Step-by-step reasoning process: Hammerhead shark:180 / 6 = 30. Great White:2(180 + 30) = 420 teeth.

Come up with a question and reasoning that would justify this answer: 1040
Question and rationale: The question is: A house's living room, dining room and kitchen take up 1,000 sq ft. The house also has a guest bedroom and a master bedroom suite. If the guest bedroom is a quarter of the size of the master bedroom suite, and the house is 2,300 sq ft total, how large is the master bedroom suite?
Step-by-step reasoning process: The house is 2,300 sq ft and we know the non - bedroom sections take up 1,000 sq ft, so that leaves 2300 - 1000 = 1,300 sq ft for the bedrooms / bathrooms. Let x be the size of the master bedroom suite. Then the guest bedroom is 0.25x. So together the bedrooms are x + 0.25x = 1.25x in size. This means 1.25x = 1300. So x = 1300 / 1.25 = 1040 sq ft.

Come up with a question and reasoning that would justify this answer: 330
Question and rationale: The question is: On our last vacation, I bought 4 times as many tetras as Tim bought clowns. Tim bought twice as many clowns as Rick bought guppies. If Rick bought 30 guppies, how many animals did we buy on our last vacation?
Step-by-step reasoning process: If Rick bought 30 guppies, Tim bought 2 clowns / guppy * 30 guppies = 60 clowns. The total number of tetras bought by you is 4 tetras / clown * 60 clowns = 240 tetras. In total, the three bought 240 tetras + 60 clowns + 30 guppies = 330 animals.

Come up with a question and reasoning that would justify this answer: 21
Question and rationale:
The question is: Mel is three years younger than Katherine. When Katherine is two dozen years old, how old will Mel be in years?
Step-by-step reasoning process: When Katherine is 2 dozen years old, she will be 2 * 12 = 24 years old. If Mel is three years younger than Katherine, then when Katherine is 24 years old, Mel will be 24 - 3 = 21 years old.