Xiaoling has 12 storybooks. After Liangliang lent 6 to Xiaoling, Liangliang's storybooks were three times that of Xiaoling's original ones. How many storybooks did Liangliang have?
小玲有故事书12本，亮亮借给小玲6本后，亮亮的故事书是小玲原有的3倍，亮亮原有故事书多少本？
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">36 + 6</gadget>
<output>42</output>

<result>42</result>