The sandbox is 3' long, 3' wide so the sq footage of the sandbox is 3*3 = <<3*3=9>>9 sq ft

He needs 9 sq ft of sand to fill the sandbox and he can buy it in 3 sq ft bags so he needs 9/3 = <<9/3=3>>3 bags of sand

The sand costs $4.00 a bag and he needs 3 bags so it will cost him 4*3 = $<<4*3=12.00>>12.00 in sand

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Josh wants to build a square sandbox that is 3 ft long, 3 ft wide for his son.  He can buy sand in 3 sq ft bags for $4.00 a bag.  How much will it cost him to fill up the sandbox?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12
Josh wants to build a square sandbox that is 3 ft long, 3 ft wide for his son.  He can buy sand in 3 sq ft bags for $4.00 a bag.  How much will it cost him to fill up the sandbox?
train