Solve the equation: 2.7: x=5*(1-10%), then x=how much.
解方程：2.7：x=5*(1-10%)，则x=多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">5 * (9/10)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">2.7 / (9/2)</gadget>
<output>0.6</output>

<result>0.6</result>