A measuring cylinder is filled with 300ml of water. After putting 3 steel balls with equal radii, the water level rises to the mark of 360ml. What is the volume of each ball in cubic centimeters?
一个量筒，盛有300毫升的水，放入3颗半径相等的钢珠后，水面上升到刻度是360毫升的地方．每颗钢珠的体积是多少立方厘米．
<gadget id="calculator">360 - 300</gadget>
<output>60</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>