Discussion
Akila scored 80% of marks in an examination. If her score was 576 marks then find the maximum marks of the examination
Answer: A
Akila's score of 576 is 80% of the maximum marks M, so \[M=\tfrac{576}{0.8}=720.\]
Check: 80% of 720 is 576. The other options give a different 80%: 620 gives 496, 820 gives 656 and 710 gives 568. So the maximum marks are 720, option A.
Equivalently, 576 corresponds to 80 parts out of 100, so one part is 7.2 and 100 parts are 720.
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