A cylindrical measuring cup with a diameter of 10 cm is filled with water. When two iron balls of the same size are immersed in the water in the measuring cup, the height of the water in the measuring cup rises from the original 12 cm to 16 cm. The volume of the ball.
一个直径是10厘米的圆柱形量杯，里面装水，当把2个同样大小的铁球浸没在量杯的水中时，量杯内的水的高度由原来的12厘米上升到16厘米，求每个铁球的体积．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 25 * 4</gadget>
<output>314</output>

<gadget id="calculator">314 / 2</gadget>
<output>157</output>

<result>157</result>