The school has a bunker with a length of 4.2 meters, a width of 2 meters and a depth of 0.5 meters. How many cubic meters of yellow sand are needed to fill this bunker?
学校有一个长4.2米，宽2米，深0.5米的沙坑．要填满这个沙坑，需要黄沙多少立方米？
<gadget id="calculator">4.2 * 2 * 0.5</gadget>
<output>4.2</output>

<result>4.2</result>