On the 2nd week, Paul halved the first week's sugar, therefore he used 24/2 = <<24/2=12>>12 cups

The third week, Paul used 12/2 = <<12/2=6>>6 cups

The fourth week, he used 6/2 = <<6/2=3>>3 cups

# Answer

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<|im_start|>system
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<|im_start|>user
Every week of last month Paul tried out a new cake recipe.  The first week, he followed a cake recipe that called for 24 cups of sugar. Each week after that, he reduced the amount of sugar by half. How much sugar did he use for the cake on the fourth week?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
3
Every week of last month Paul tried out a new cake recipe.  The first week, he followed a cake recipe that called for 24 cups of sugar. Each week after that, he reduced the amount of sugar by half. How much sugar did he use for the cake on the fourth week?
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