I'll give you a question, please answer with step-by-step reasoning process.
In a day, Sam hunts 6 animals. Rob hunts half as many animals as Sam. Mark hunts 1/3 of the total of what Rob and Sam hunt. If Peter hunts 3 times as many animals as Mark does, how many animals do they all hunt in a day?

21
Rob hunts 1 / 2 * 6 animals / day = 3 animals / day.

Rob and Sam hunt 3 animals / day + 6 animals / day = 9 animals / day.

Mark hunts 1 / 3 * 9 animals / day = 3 animals in a day.

Peter hunts 3 * 3 animals / day = 9 animals in a day.

The total they all hunt in a day is 6 animals / day + 3 animals / day + 3 animals / day + 9 animals / day = 21 animals.

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Thus, the answer is 21