A glass of fruit juice weighs 3.5 kg, the first time I drank (1/3), the second time I drank the rest (1/5), and then filled up with milk. Drink (1/2) for the third time, and drink the rest (1/4) for the fourth time, how many kilograms does the remaining juice in the glass weigh?
一杯果汁重3.5千克，第一次喝了(1/3)，第二次喝了余下的(1/5)，然后加满牛奶．第三次喝了(1/2)，第四次喝了余下的(1/4)，这时杯子里剩下的果汁重多少千克．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</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">3.5 * (2/3) * (4/5) * (1/2) * (3/4)</gadget>
<output>0.7</output>

<result>0.7</result>