Lili bought 3 notebooks, each cost 3 yuan, and bought 4 pens. The price of each pen is twice the price of a notebook. How much did Lili spend in total?
丽丽买了3个笔记本，每本3元钱，又买了4枝钢笔，每支钢笔的价钱是一本笔记本价钱的2倍，丽丽一共花了多少钱？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">3 * 2 * 4</gadget>
<output>24</output>

<gadget id="calculator">9 + 24</gadget>
<output>33</output>

<result>33</result>