There is a barrel of wine, and the same amount of wine is leaked every day due to cracks in the barrel. Now if the barrel of wine is given to 6 people, it can be drunk in 4 days; if it is given to 4 people, it can be drunk in 5 days. How many people can drink a day with the wine that is leaked from this barrel of wine every day?
有一桶酒，每天都因桶有裂缝而要漏掉等量的酒，现在这桶酒如果给6人喝，4天可喝完；如果给4人喝，5天可喝完．这桶酒每天漏掉的酒可供几人喝一天？
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">24 - 20</gadget>
<output>4</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">4 / 1 / 1</gadget>
<output>4</output>

<result>4</result>