The master worker had to assemble 1200 bicycles, and 450 bicycles were assembled in 3 days. According to this calculation, how many days will it take for the rest to be installed?
工人师傅要装配1200辆自行车，3天装配了450辆．照这样计算，余下的还要几天才能装完？
<gadget id="calculator">450 / 3</gadget>
<output>150</output>

<gadget id="calculator">1_200 / 150</gadget>
<output>8</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<result>5</result>