Three times a number is 24 less than 64.5, what is this number?
一个数的3倍比64.5少24，这个数是多少？
<gadget id="calculator">64.5 - 24</gadget>
<output>40.5</output>

<gadget id="calculator">40.5 / 3</gadget>
<output>13.5</output>

<result>13.5</result>