A cuboid has a volume of 210 cubic centimeters, a width of 6 cm, and a height of 5 cm. What is its length?
长方体的体积是210立方厘米，宽6厘米，高5厘米．它的长是多少？
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">210 / 30</gadget>
<output>7</output>

<result>7</result>