The school digs a sandpit with a length of 4 meters, a width of 2 meters, and a depth of 0.5 meters. Each cubic meter of sand weighs 1.5 tons. How many tons of yellow sand are needed to fill the sandpit?
学校挖一个沙坑，长4米，宽2米，深0.5米，每立方米沙子重1.5吨，填满这个沙坑共需多少吨黄沙？
<gadget id="calculator">4 * 2 * 0.5 * 1.5</gadget>
<output>6</output>

<result>6</result>