Liangliang's family uses an average of 3 kilowatt-hours of electricity per day. How many kilowatt-hours of electricity did their family use in February this year?
亮亮家平均每天用3千瓦时电，今年2月他们家共用电多少千瓦时．
<gadget id="calculator">3 * 28</gadget>
<output>84</output>

<result>84</result>