A worker assembles a batch of parts, and plans to assemble 60 parts per day, which can be completed in 40 days. 80 pieces are actually assembled every day, how many days are actually assembled?
某工人装配一批零件，计划每天装配60个，40天可以装配完．实际每天装配了80个，实际装配了多少天？
<gadget id="calculator">40 / 80</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">60 * (1/2)</gadget>
<output>30</output>

<result>30</result>