A plumber bought 10 meters of copper and 5 more meters of plastic pipe. If each meter cost $4, how much did the plumber spent on the copper and plastic pipe?
Let's think step by step.
100
He bought 10 + 5 = 15 meters of plastic pipe.

The total meters of the copper and plastic pipe is 10 + 15 = 25.

The plumber spent $4 x 25 = $100 on copper and plastic pipe.

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The answer: 100