The TV factory plans to produce 490 TV sets, and 70% of them have been produced. How many TV sets will be produced to complete the task?
电视机厂计划生产490台电视机，已经生产了70%，还要生产多少台电视机才能完成任务？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">490 * (3/10)</gadget>
<output>147</output>

<result>147</result>