There are two children, A and B, standing side by side in a swimming pool. (1/4) of the height of A is above the water, and (2/5) of B is above the water. The total height of the two children is 270 cm. How deep is the water in cm?
有AB两位小朋友并排站在游泳池中，A身高的(1/4)露出水面，B有(2/5)露出水面，两位小朋友身高总和是270厘米，水深多少厘米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">270 * (1/4) * (2/5)</gadget>
<output>27</output>

<gadget id="calculator">270 * (2/5)</gadget>
<output>108</output>

<gadget id="calculator">270 * (1/4)</gadget>
<output>135/2 = around 67.5</output>

<gadget id="calculator">27 - 108 - (135/2)</gadget>
<output>-297/2 = around -148.5</output>

<gadget id="calculator">270 + (-297/2)</gadget>
<output>243/2 = around 121.5</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 + (7/20)</gadget>
<output>27/20 = around 1.35</output>

<gadget id="calculator">(243/2) / (27/20)</gadget>
<output>90</output>

<result>90</result>