Xiao Ming miscalculated to multiply (2/7) by dividing a number by (2/7), and the result was (3/28). What is the correct number?
小明把一个数除以(2/7)错算成乘(2/7)，结果得(3/28)，正确的得数应是多少？
<gadget id="calculator">3 / 28</gadget>
<output>3/28 = around 0.107143</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(3/28) / (2/7) / (2/7)</gadget>
<output>21/16 = around 1.3125</output>

<result>21/16 = around 1.3125</result>