Subtract 12 from 3 times a number, and the result is 48. What is this number?
一个数的3倍减去12，结果是48，这个数是多少？
<gadget id="calculator">48 + 12</gadget>
<output>60</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>