A test has twenty questions worth 100 marks in total. There are two types of questions. Multiple choice questions are worth 3 marks each and essay questions are worth 11 marks each. How many multiple choice questions does the exam have?
20 questions
totol 100 marks
Multiple choice questions are worth 3 marks each and essay questions are worth 11 marks each.
x+y=20----------------------------------------------------------1
3x+11y=100---------------------------------------------------2
solve 1 and 2
x=15 so MCQ are 15