There is a pool full of water, if a pool of water is released for the first time (3/8), a pool of water is released for the second time (1/4), and a pool of water is injected for the third time (4/7). What percentage of the pool is the water in the pool now?
有一个装满水的水池，若第一次放出一池水的(3/8)，第二次放出一池水的(1/4)，第三次又注入一池水的(4/7)．现在池子里的水占池子的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">1 - (3/8) - (1/4)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(3/8) + (4/7)</gadget>
<output>53/56 = around 0.946429</output>

<result>53/56 = around 0.946429</result>