When three cylinders of the same size are put together to form a large cylinder with a height of 60 cm, the surface area is reduced by 40 square centimeters. What is the volume of each small cylinder in cubic centimeters?
三个同样大小的圆柱拼成一个高为60厘米的大圆柱时，表面积减少了40平方厘米，原来每个小圆柱的体积是多少立方厘米．
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<result>200</result>