A company purchased 300 Lenovo computers, and after selling some, there are still 120 left. How many Lenovo computers were sold?
某公司购进300台联想电脑，卖出一些后还剩下120台，卖了多少台联想电脑？
<gadget id="calculator">300 - 120</gadget>
<output>180</output>

<result>180</result>