The price of a black and white TV is 620 yuan, and the price of an electric fan is 18 yuan less than half the price of a black and white TV. How much is an electric fan?
一台黑白电视机价钱620元，一台电风扇的价钱比一台黑白电视机价钱的一半还少18元，一台电风扇多少元？
<gadget id="calculator">620 / 2</gadget>
<output>310</output>

<gadget id="calculator">310 - 18</gadget>
<output>292</output>

<result>292</result>