Xiao Ming originally had 50 stamps, and Xiao Qiang originally had 30 stamps. Xiao Ming collects 5 stamps every month, and Xiao Qiang collects 9 stamps every month. After a few months, the two will collect the same amount of stamps?
小明原来有邮票50枚，小强原来有邮票30枚，小明每月集邮票5枚，小强每月集邮票9枚，几个月后两人集的邮票就一样多了？
<gadget id="calculator">50 - 30</gadget>
<output>20</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>