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#45
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Hello! I don't understand how to calculate the answer in the zombie problem. The result is different depending on who goes first, but neither of the answer options I calculated is accepted. What should the answer be?

[spoiler=My answers]I calculated that if the group of 25 zombies attacks first, there will be 17 left, and if the group of 20 zombies attacks first, there will be 13 left in the larger group. Neither of these values is correct.[/spoiler]