80% of a number is 4 more than the reciprocal of (5/6). Find this number.
一个数的80%比(5/6)的倒数多4，求这个数．
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) + 4</gadget>
<output>26/5 = around 5.2</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(26/5) / (4/5)</gadget>
<output>13/2 = around 6.5</output>

<result>13/2 = around 6.5</result>