The school has newly dug a sandpit, which is 5m long, 3m wide, and 0.4m deep. How much sand is needed to fill the sandpit?
学校新挖了一个沙坑，长5m，宽3m，深0.4m，需要多少沙子才能填满沙坑？
<gadget id="calculator">5 * 3 * 0.4</gadget>
<output>6</output>

<result>6</result>