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? Think carefully first, then make a decision:
100% - 80% = 20% of Miss Lawrence's exam are multiple - choice questions. Thus, there are 50 x 20 / 100 = 10 multiple - choice questions. So, the answer is 10.