The price of a student chair is 24 yuan, and the price of a desk is twice that of a chair. How much does it cost to buy a set of such desks and chairs?
一张学生椅的价格是24元，一张课桌的价格是一张椅子的2倍，买一套这样的桌椅共用多少元钱？
<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<gadget id="calculator">48 + 24</gadget>
<output>72</output>

<result>72</result>