100% - 80% = 20% of Miss Lawrence's exam are multiple-choice questions.

Thus, there are 50 x 20/100 = <<50*20/100=10>>10 multiple-choice questions.

# Answer

10
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
On Miss Lawrence's math exam, 80% of the 50 questions are problem-solving while the rest are multiple-choice questions. How many multiple-choice questions are there?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
On Miss Lawrence's math exam, 80% of the 50 questions are problem-solving while the rest are multiple-choice questions. How many multiple-choice questions are there?
train