A washing machine factory plans to produce 42,000 washing machines this year and has produced 3,000 units per month on average for 6 months. How many thousands of units per month will the remaining tasks be completed on average?
某洗衣机厂今年计划生产洗衣机4.2万台已经生产了6个月，平均每个月生产0.3万台，余下的任务，平均每个月要生产多少万台才能完成？
<gadget id="calculator">6 * 0.3</gadget>
<output>1.8</output>

<gadget id="calculator">4.2 - 1.8</gadget>
<output>2.4</output>

<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">2.4 / 6</gadget>
<output>0.4</output>

<result>0.4</result>