Xiao Ming has collected 20 stamps, 7 of which are commemorative stamps. How much does the number of commemorative stamps account for in the total number of stamps?
小明收集了20枚邮票，其中7枚是纪念邮票．纪念邮票的枚数占邮票总枚数的几分之几？
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>