A store originally had 280 TV sets of A and B types, of which A-type TVs accounted for (1/5), and some A-type TVs were imported later. At this time, A-type TV sets account for (3/10) the total number of the two types of TV sets. How many A-type TV sets are shipped in?
某商店原有A、B两种电视机共280台，其中A型电视机占(1/5)，后来又运进一些A型电视机．这时A型电视机占两种电视机总台数的(3/10)，问又运进A型电视机多少台？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">280 * (4/5)</gadget>
<output>224</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">224 / (7/10)</gadget>
<output>320</output>

<gadget id="calculator">320 - 280</gadget>
<output>40</output>

<result>40</result>