The volume of a cuboid water tank is 84L. Its height is 3dm and its width is 4dm when measured from the inside. What is its length?
一个长方体的水箱容积是84L，从里面量它的高为3dm，宽为4dm，它的长是多少
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">84 / 12</gadget>
<output>7</output>

<result>7</result>