A certain electric appliance city bought 150 TVs last month, and the number of refrigerators sold was 4/5 that of TVs. How many refrigerators were sold less than TVs?
某电器城上个月买出电视机150台，卖出冰箱的台数是电视机的(4/5)，卖出的冰箱比电视机少有多少台？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<result>30</result>