Subtract 5 times of a certain number from 6.75 to get 2.75, find a certain number.
6.75减去某数的5倍得2.75，求某数．
<gadget id="calculator">6.75 - 2.75</gadget>
<output>4</output>

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

<result>4/5 = around 0.8</result>