Since barbara needs $100, and she currently has $20, she is remaining with $100-$20 = $<<100-20=80>>80 to save

With an allowance of $5 each week, she'll need to save for 80/5 = 16 weeks

# Answer

16
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Barbara wants to save up for a new wristwatch that costs $100. Her parents give her an allowance of $5 a week and she can either save it all up for the watch or spend it as she wishes. 10 weeks pass and due to spending some of her money on ice cream, Barbara currently only has $20. How many more weeks does she need to save for a watch if she stops spending on other things right now?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
16
Barbara wants to save up for a new wristwatch that costs $100. Her parents give her an allowance of $5 a week and she can either save it all up for the watch or spend it as she wishes. 10 weeks pass and due to spending some of her money on ice cream, Barbara currently only has $20. How many more weeks does she need to save for a watch if she stops spending on other things right now?
train