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.is the reasoning for what question and answer pair?
Q: 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?
A: 100