A large cylinder with a height of 12 decimeters can be assembled by using 4 identical small cylinders. The sum of the surface areas of the 4 small cylinders is reduced by 300 square decimeters. Find the volume of each small cylinder?
用4个完全一样的小圆柱可以拼接成一个高12分米的大圆柱，4个小圆柱的表面积之和减少了300平方分米，求每个小圆柱的体积？
<gadget id="calculator">300 / 6</gadget>
<output>50</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<result>150</result>