Uncle Wang’s house has a pool that is 3 meters long, 2 meters wide, and 1.5 meters deep. He wants the volume of the pool to reach 10.5 cubic meters. How many meters should the pool be dug down?
王大伯家有个长3米、宽2米、深1.5米的水池，他想让水池的容积达到10.5立方米，应将水池再向下挖深多少米？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">10.5 / 6</gadget>
<output>1.75</output>

<gadget id="calculator">1.75 - 1.5</gadget>
<output>0.25</output>

<result>0.25</result>