The minuend is 10.8, it is known that the subtrahend is 80% of the difference, what is the subtrahend.
被减数是10.8，已知减数是差的80%，减数是多少．
<gadget id="calculator">10.8 / 1.8</gadget>
<output>6</output>

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

<gadget id="calculator">6 * (4/5)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>