Luke tested four materials, P, Q, R, and S, by scratching them against each other. The table below shows the results. Which material is the hardest?
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Worked Solution
Step 1: Hardness is the ability to resist scratches. A harder material scratches a softer one.
Step [2-9]: Look for the material that was not scratched by any other.
Step [2-9]: Material Q scratched P, R, and S, and was not scratched. Thus, Q is the hardest.
Correct answer: Material Q
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