If the sum of the circumferences of the two circles is 62.8 cm, what is the sum of the diameters of the two circles in cm?
两个圆的周长之和为62.8厘米，那么，这两个圆的直径之和为多少厘米．
<gadget id="calculator">62.8 / 3.14</gadget>
<output>20</output>

<result>20</result>