10 kg of paint is used to paint a classroom, and how many kg of paint is needed to paint a classroom whose length, width, and height are twice that of it.
粉刷一间教室用涂料10千克，粉刷长、宽、高都是它2倍的教室，需涂料多少千克．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>