A cuboid swimming pool is 50 meters long, 40 meters wide, and 1.5 meters deep. The four walls are made of marble with an area of 0.25 square meters. How many pieces of marble are needed?
一个长方体游泳池，长50米，宽40米，深1.5米，四壁用面积是0.25平方米的大理石砌成，需要大理石多少块？
<gadget id="calculator">50 * 1.5 * 2</gadget>
<output>150</output>

<gadget id="calculator">40 * 1.5 * 2</gadget>
<output>120</output>

<gadget id="calculator">150 + 120</gadget>
<output>270</output>

<gadget id="calculator">270 / 0.25</gadget>
<output>1_080</output>

<result>1_080</result>