Barney uses 2 clean towels every day, so he uses 2 * 7 = <<2*7=14>>14 towels a week.

He missed one week of laundry, so he would need 2 * 14 = <<2*14=28>>28 towels for 2 weeks.

He owns 18 towels, so he has 28 - 18 = <<28-18=10>>10 less than he needs.

Thus, Barney will not have clean towels on 10 / 2 = <<10/2=5>>5 days.

# Answer

5
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Barney washes his kitchen towels once a week. He owns eighteen towels and uses two at a time that he changes to clean towels daily. He missed one week of laundry. How many days the following week will Barney not have clean towels?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
Barney washes his kitchen towels once a week. He owns eighteen towels and uses two at a time that he changes to clean towels daily. He missed one week of laundry. How many days the following week will Barney not have clean towels?
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