Xiao Wei collected some pictures, and he took out half of the pictures and gave them to Xiao Ming, and he had 20 pictures left. How many pictures did Xiaowei originally have?
小伟收集了一些画片，他拿出画片的一半少l张送给小明，自己还剩20张．小伟原来有多少张画片？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">19 * 2</gadget>
<output>38</output>

<result>38</result>