The height of a cuboid is 4 cm. If the width is reduced by 2 cm, the volume is reduced by 64 cubic centimeters. What is the length of the cuboid in cm?
一个长方体高4厘米，如果把宽减少2厘米，体积减少64立方厘米，这个长方体的长是多少厘米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">64 / 8</gadget>
<output>8</output>

<result>8</result>