The sum of 4 times a number plus the product of 3 and 8 is 72. What is this number?
一个数的4倍加上3与8的积，和是72，这个数是多少．
<gadget id="calculator">3 * 8</gadget>
<output>24</output>

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

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>