A teacher has marked 9 out of the 20 exercise books he needed to mark. What percentage are left for him to mark?
Question
A teacher has marked 9 out of the 20 exercise books he needed to mark. What percentage are left for him to mark?
Solution
Step 1: First, we need to find out how many exercise books are left to be marked. We do this by subtracting the number of books already marked from the total number of books. So, 20 (total books) - 9 (marked books) = 11 books left to be marked.
Step 2: Next, we need to calculate the percentage of books left to be marked. The formula to calculate percentage is (part/total) * 100. In this case, the part is the number of books left to be marked (11) and the total is the total number of books (20). So, (11/20) * 100 = 55%.
Therefore, 55% of the exercise books are left for the teacher to mark.
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