In the second quarter of last year, Weiliang Tungsten Company saved an average of 20 kilowatt-hours of electricity per month. According to this calculation, how much electricity was saved in the fourth quarter.
伟良钨业公司去年第二季度平均每月节约用电20度，照这样计算，第四季度共节约用电多少度．
<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<result>60</result>