There is a pool full of water, and spring water gushes out continuously from the bottom of the pool. If 24 pumps can be used to drain the pool in 6 days, and if 21 pumps can be used to drain the pool in 8 days, if the pool can never be drained, then at most How many pumps are used to pump water?
有一满池水，池底不断有泉水涌出，若用24部抽水机6天可以抽干池水，若用21部抽水机8天可以抽干，若要使这一池水永远抽不干，则最多只能用几部抽水机抽水？
<gadget id="calculator">21 * 8</gadget>
<output>168</output>

<gadget id="calculator">24 * 6</gadget>
<output>144</output>

<gadget id="calculator">168 - 144</gadget>
<output>24</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>12</result>