Xiaoxiao has 1.5 times as many extracurricular books as Naughty. If Xiaoxiao gives Naughty 30 extracurricular books, both of them will have the same number of extracurricular books. How many extracurricular books does Xiaoxiao have?
笑笑的课外书是淘气的1.5倍，如果笑笑给淘气30本课外书，两人的课外书本数就同样多，笑笑有多少本课外书．
<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">60 / 0.5</gadget>
<output>120</output>

<gadget id="calculator">120 * 1.5</gadget>
<output>180</output>

<result>180</result>