Xiao Gang and Xiao Ming have a total of 90 stamps, and Xiao Gang gave Xiao Ming 18 stamps, and the two have the same number of stamps. How many stamps did Xiao Ming have?
小刚和小明共有邮票90张，小刚送给小明18张后两人的邮票同样多，小明原有邮票多少张．
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">90 - 36</gadget>
<output>54</output>

<gadget id="calculator">54 / 2</gadget>
<output>27</output>

<result>27</result>