The factory has to process 455 parts, Master Li processes 35 parts every day, and Master Wang processes 28 parts every day. Master Li processed it for 4 days first, and the rest were processed by Master Li and Master Wang together. How many days will it take to process the remaining parts?
工厂要加工455个零件，李师傅每天加工35个，王师傅每天加工28个．先由李师傅加工了4天，剩下的由李师傅和王师傅一起加工，剩下的零件还要加工多少天？
<gadget id="calculator">35 * 4</gadget>
<output>140</output>

<gadget id="calculator">455 - 140</gadget>
<output>315</output>

<gadget id="calculator">35 + 28</gadget>
<output>63</output>

<gadget id="calculator">315 / 63</gadget>
<output>5</output>

<result>5</result>