In sugar water with a sugar content of 25%, how much less sugar than water.
在含糖率是25%的糖水中，糖比水少多少．
<gadget id="calculator">25 / 100</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">(3/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / (3/4)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>