(2/3) of a number is 4 less than 56, what is this number?
一个数的(2/3)比56少4，这个数是多少？
<gadget id="calculator">56 - 4</gadget>
<output>52</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">52 / (2/3)</gadget>
<output>78</output>

<result>78</result>