Fill the bottle with water, pour out (1/2) of all the water, then add the same amount of alcohol, pour out (1/3) of the entire solution, and fill it up with alcohol. Then pour out (1/4) of the whole solution, and fill it up with alcohol. So what percentage of the total solution is the alcohol at this time?
瓶内装满水，倒出全部水的(1/2)，然后再加入同样多的酒精，又倒出全部溶液的(1/3)，又用酒精倒满．然后倒出全部溶液的(1/4)，再用酒精加满．那么这时的酒精占全部溶液的百分之几？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) * (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/2) + (1/6) + (1/12)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>