The toy factory wants to produce a batch of toys. The original plan is to produce 60 pieces per day, which will be completed in 6 days. The actual daily production is 30 more than the original plan. How many days did it actually take to produce this batch of toys?
玩具厂要生产一批玩具，原计划每天生产60件，6天完成．实际每天比原计划多生产30件．生产这批玩具实际用了多少天？
<gadget id="calculator">60 + 30</gadget>
<output>90</output>

<gadget id="calculator">6 / 90</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">60 * (1/15)</gadget>
<output>4</output>

<result>4</result>