Measure the water storage depth of the pool, insert a 6-meter-long bamboo pole into the water, the part that enters the mud is (9/10) meters, and the part above the water surface is (3/5) meters, how many meters is the water storage depth of the pool?
测量水池蓄水的深度，把6米长的竹竿插到水中，入泥部分是(9/10)米，露出水面(3/5)米，水池蓄水深度是多少米？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 - (9/10) - (3/5)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>