Final answer:
The student missed 8 questions out of 20 on the test.
Step-by-step explanation:
To find out how many questions the student missed, you can subtract the percentage of correct answers from 100%. In this case, the student earned a grade of 60%, so the percentage of questions they missed is 100% - 60% = 40%. To determine the number of questions missed, you can multiply this percentage by the total number of questions on the test: 40% of 20 questions = 0.4 * 20 = 8.
Learn more about missing questions