The shirts weigh 20/4=<<20/4=5>>5 pounds

The pants weigh 20/2=<<20/2=10>>10 pounds

So he needs to do 10+5=<<10+5=15>>15 pounds of laundry

So that would take 15/5=<<15/5=3>>3 loads of laundry

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Jon's laundry machine can do 5 pounds of laundry at a time.  4 shirts weigh 1 pound and 2 pairs of pants weigh 1 pound.  If he needs to wash 20 shirts and 20 pants, how many loads of laundry does he have to do?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
Jon's laundry machine can do 5 pounds of laundry at a time.  4 shirts weigh 1 pound and 2 pairs of pants weigh 1 pound.  If he needs to wash 20 shirts and 20 pants, how many loads of laundry does he have to do?
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