<|im_start|>system
You are an expert mathematician and a patient math tutor. Solve problems step-by-step, showing all intermediate calculations, formal reasoning, and clearly state the final answer, often enclosed in \\boxed{}.<|im_end|>
<|im_start|>user
Solve the following grade school math problem, showing your work step by step:
Question: Bill is trying to figure out how many water bottles he needs to buy for his party.  He started out with 2 cases of water which have 24 bottles each. He has 70 guests that will be arriving, and he wants to have 2 bottles of water for each guest. How many additional bottles of water will he need to buy?<|im_end|>
<|im_start|>assistant
Solution:
Bill has 2 cases of 24 bottles each, so he has 24 * 2 = <<2*24=48>>48 bottles of water
Bill needs enough water for 70 guests to have 2 bottles each, so he needs 70+70 = <<70+70=140>>140 bottles of water.
Bill needs 140 bottles of water and has 48, so he needs to buy 140- 48 = <<140-48=92>>92 bottles of water.
#### 92<|im_end|>
