There was a vegetable seller who was very dishonest. He had a tampered scale, the arms of which were unequal in length. One day, when he bought cabbage from a farmer that actually weighed 5 kilograms, he put the cabbage on the shorter side of the balance arm, which made it lighter, and the balance showed that it weighed only 4 kilograms; When he weighed the cabbage, he put the cabbage on the longer side of the balance arm, so how many kilograms would the cabbage weigh?
有一位菜贩很不诚实，他有一架动过手脚的天平，这架天平的两臂不等长．有一天，当他向农民购买实际重5千克的白菜时，就把白菜放在天平臂较短的一侧，这样称起来较轻，天平显示只有4千克重；而当他把白菜卖出去的时候，他就把白菜放在天平臂较长这一侧，这样称起来白菜会有多少千克？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / (4/5)</gadget>
<output>25/4 = around 6.25</output>

<result>25/4 = around 6.25</result>