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?
He bought 10 + 5 = 
<gadget id="calculator">10+5</gadget>
<output>15</output>
15 meters of plastic pipe.
The total meters of the copper and plastic pipe is 10 + 15 = 
<gadget id="calculator">10+15</gadget>
<output>25</output>
25.
The plumber spent $4 x 25 = $
<gadget id="calculator">4*25</gadget>
<output>100</output>
100 on copper and plastic pipe.

<result>100</result>