Upper Elementary:
Question: Benjamin and Jerry shared a brie and butter baguette for dinner. Benjamin ate 3/10 of the baguette, and Jerry ate 2/5 of it. The uneaten part of the baguette weighs 41/2 ounces. How many ounces of the baguette did Jerry eat?
Answer: 6 ounces
Solution: First, we need to know what fractional part of the sandwich is uneaten. Since Benjamin ate 3/10 and Jerry ate 2/5 = 4/10, they ate 7/10 of the baguette in total. That means that the remaining 3/10 of the baguette weighs 41/2 ounces. Each tenth of the baguette therefore weighs 41/2 ÷ 3 = 11/2 ounces. So, since Jerry ate 4/10 of the baguette, his piece was 11/2 × 4 = 6 ounces.
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