Lizzy: Ernest bought 50 meters of wire and cut it into 5 equal parts. He then used 3 parts of the wire. How many meters of wire is not used?.
Me: Hmmm, let me think. I think this is the detailed solution:
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Each part of the wire is 50 / 5 = 10 meters long. Ernest used 3 parts, then he used 10 x 3 = 30 meters of the wire. Therefore, 50 - 30 = 20 meters of wire is not used. Final answer: 20.
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