84 is subtracted from 4 times a number, the difference is 24, what is this number?
一个数的4倍减84，差是24，这个数是多少？
<gadget id="calculator">24 + 84</gadget>
<output>108</output>

<gadget id="calculator">108 / 4</gadget>
<output>27</output>

<result>27</result>