<human>:  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?
<bot>: How many multiple-choice questions are there? ** 100% - 80% = 20% of Miss Lawrence's exam are multiple-choice questions.
How many multiple-choice questions are there? ** Thus, there are 50 x 20/100 = <<50*20/100=10>>10 multiple-choice questions.
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