The master workers have to install 1,500 bicycles, and 450 bicycles have been installed in 3 days. According to this calculation, how many days will it take for the rest to be installed?
工人师傅要安装1500辆自行车，3天安装了450辆，照这样计算余下的还要几天才能装完？
<gadget id="calculator">1_500 - 450</gadget>
<output>1_050</output>

<gadget id="calculator">450 / 3</gadget>
<output>150</output>

<gadget id="calculator">1_050 / 150</gadget>
<output>7</output>

<result>7</result>