A courier company wants to pack a batch of mobile phones, 220 mobile phones will be packed into 5 packs, and finally packed into 9 packs just to complete the packaging. Q: How many mobile phones are there in total?
某快递公司要将一批手机打包，打成5包要余220部手机，最后打成9包刚好包装完成．问：手机一共多少部？
<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">220 / 4</gadget>
<output>55</output>

<gadget id="calculator">55 * 9</gadget>
<output>495</output>

<result>495</result>