When you drive to the (2/3) distance, your fuel tank has changed from the original full tank to only (1/4) tank of fuel. Ask how far you can drive the car to the end using only the remaining oil.
当你开车到了(2/3)路程时，你的油箱已由原来的满箱到只有(1/4)箱油．问只用这些剩下的油你能将车开到距终点多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/3) / (3/4)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 - (8/9)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>