Yogurt is 12 yuan per box, and peanut milk is 9 yuan per box. The money I bring is just enough to buy 15 boxes of yogurt. If you use this money to buy peanut milk, how many boxes can you buy?
酸奶每盒12元，花生奶每盒9元，我带的钱正好能买15盒酸奶．如果用这些钱买花生奶，能买几盒？
<gadget id="calculator">15 / 9</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">12 * (5/3)</gadget>
<output>20</output>

<result>20</result>