What is the number after adding (1/7) to a number is 5.6.
一个数增加它的(1/7)后是5.6，这个数是多少．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 + (1/7)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">5.6 / (8/7)</gadget>
<output>4.9</output>

<result>4.9</result>