First find half the number of guests at Carly's party: 30 guests / 2 = <<30/2=15>>15 guests

Then multiply that number by 2 for the number of burgers half the guests want: 15 guests * 2 burgers/guest = <<15*2=30>>30 burgers

Then add the 15 burgers for the 15 guests who only want 1 to find the total number of burgers: 30 burgers + 15 burgers = 45 burgers

Then divide the total number of burgers by the number of burgers Carly can cook at once to find the number of batches she cooks: 45 burgers / 5 burgers/batch = <<45/5=9>>9 batches

Then multiply the number of sides per burger by the cooking time per side to find each burger's total cook time: 4 minutes/side * 2 sides = <<4*2=8>>8 minutes

Finally, multiply each batch's cook time by the number of batches to find the total cook time: 8 minutes/batch * 9 batches = <<8*9=72>>72 minutes

# Answer

72
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Carly is making burgers for a neighborhood BBQ. Each burger needs to be cooked for 4 minutes on each side. Carly can fit 5 burgers on the grill at once. If half her 30 guests want 2 burgers and the other half each want 1, how long will it take Carly to cook all the burgers?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
72
Carly is making burgers for a neighborhood BBQ. Each burger needs to be cooked for 4 minutes on each side. Carly can fit 5 burgers on the grill at once. If half her 30 guests want 2 burgers and the other half each want 1, how long will it take Carly to cook all the burgers?
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