20 (2/7) is less than 6 times (2/7) of a number, what is this number?
20的(2/7)比一个数的6倍少(2/7)，这个数是多少？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">20 * (2/7)</gadget>
<output>40/7 = around 5.714286</output>

<gadget id="calculator">(40/7) + (2/7)</gadget>
<output>6</output>

<gadget id="calculator">6 / 6</gadget>
<output>1</output>

<result>1</result>