Use a water pump to inject water into the empty pool. The water injected in the morning takes up 8/21 of the volume of the pool, and 58.5 cubic meters of water is injected in the afternoon, which is just full. What is the volume of this pool?
用一台抽水机往空池内注水，上午4小时注入的占水池容积的(8/21)，下午又注入58.5立方米的水，正好注满．这个水池的容积是多少？
<gadget id="calculator">8 / 21</gadget>
<output>8/21 = around 0.380952</output>

<gadget id="calculator">1 - (8/21)</gadget>
<output>13/21 = around 0.619048</output>

<gadget id="calculator">58.5 / (13/21)</gadget>
<output>94.5</output>

<result>94.5</result>