Xiao Min and Wang Gang are both stamp collectors. The ratio of the number of stamps between Xiao Min and Wang Gang is 3:5. If Wang Gang gives Xiao Min 9 stamps, then their number of stamps will be equal. How many stamps do they share?
小敏和王刚都是集邮爱好者．小敏和王刚现在两人邮票张数的比是3：5，如果王刚给小敏9张邮票，那么他们的邮票张数就相等．两人共有邮票多少枚．
<gadget id="calculator">9 + 9</gadget>
<output>18</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">18 / (2/5)</gadget>
<output>45</output>

<gadget id="calculator">45 + 27</gadget>
<output>72</output>

<result>72</result>