Insert three wooden sticks A, B, and C vertically into the pool, stick A has (4/5) stick out of the water, stick B has (4/7) stick out of the water, stick C has (2/5) stick out On the surface of the water, if the total length of the three wooden sticks is 450 cm, how deep is the pool?
用甲、乙、丙三根木棒竖直地插入水池中，甲木棒有(4/5)露出水面，乙木棒有(4/7)，露出水面，丙木棒有(2/5)露出水面，如果三根木棒总长是450厘米，水池有多深？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

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

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 / (3/7)</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">5 + (7/3) + (5/3)</gadget>
<output>9</output>

<gadget id="calculator">450 / 9</gadget>
<output>50</output>

<result>50</result>