When a food factory makes cakes, it is stipulated that 5 eggs should be added for every 400 grams of flour. The existing flour is 6.4 kg, and 39 eggs have been added. How many more eggs should be added to meet the specified egg composition.
某食品厂制作蛋糕时，规定每400克面粉需加进5只鸡蛋，现有面粉6.4千克，已加进39只鸡蛋，还需加进多少只鸡蛋，才能符合规定的鸡蛋成份．
<gadget id="calculator">400 / 1_000</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">6.4 / (2/5)</gadget>
<output>16</output>

<gadget id="calculator">16 * 5</gadget>
<output>80</output>

<gadget id="calculator">80 - 39</gadget>
<output>41</output>

<result>41</result>