Siti conducted an experiment to test the hardness of three materials. She used each material to scratch the others. Based on the table, which material is the SOFTEST?
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Worked Solution
Step 1: Hardness is the ability of a material to resist being scratched.
Step 2: A harder material will leave a scratch on a softer one.
Step 3: Material Z was scratched by both X and Y and could not scratch either. Thus, Z is the softest.
Correct answer: Material Z
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