Jun Jie tested the properties of four materials, P, Q, R, and S. The results are shown in the table below. Which material is most suitable for making a swimming float?
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Worked Solution
Step 1: Identify the requirements for a swimming float: it must float and be waterproof.
Step [2-9]: Check the table. Only Q and S float. Only Q and R are waterproof.
Step [2-9]: Material Q is the only one that meets both criteria.
Correct answer: Material Q
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