The assembly workshop needs to assemble 300 color TV sets, and 180 sets have been assembled, what fraction of the assembly task is left?
装配车间要装配300台彩电，已经装配了180台，还剩下装配任务的几分之几？
<gadget id="calculator">300 - 180</gadget>
<output>120</output>

<gadget id="calculator">120 / 300</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>