The school wants to dig a rectangular bunker, 4 meters long, 2 meters wide, and 4 decimeters deep. How many cubic meters of yellow sand are needed to fill it?
学校要挖一个长方形状沙坑，长4米，宽2米，深4分米，需要多少立方米的黄沙才能填满？
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4 * 2 * (2/5)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>