A cuboid iron block with a length of 9 cm, a width of 7 cm, and a height of 3 cm is melted and cast into a cuboid with a base area of 20 cm**2. What is the height of this cuboid in cm.
把一个长9cm，宽7cm，高3cm的长方体铁块和一块棱长5cm的正方体铁块熔铸成一个底面积是20cm**2的长方体．这个长方体的高是多少cm．
<gadget id="calculator">9 * 7 * 3</gadget>
<output>189</output>

<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<gadget id="calculator">189 + 125</gadget>
<output>314</output>

<gadget id="calculator">314 / 20</gadget>
<output>157/10 = around 15.7</output>

<result>157/10 = around 15.7</result>