Middle School:
Question: An anemone catches 10 pounds of food over the course of a week and consumes 62.5% of it. A school of clownfish that lives with the anemones eat 3/8 of the anemone's uneaten prey. What percentage of the anemone's food goes uneaten?
Answer: 23.4375%
Solution: Since 62.5% of the anemone’s prey is eaten, that means 100% – 62.5% = 37.5% of it is not eaten. The clownfish eat 3/8 of the leftovers, so they leave 1 – 3/8 = 5/8 uneaten. So, since 5/8 = 62.5%, we need to find 62.5% of 37.5%. We do that by multiplying 0.625 × 0.375 = 0.234375 = 23.4375%.
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