A batch of fruit is bought 400 kg more on the first day than on the second day, and 12.5% less on the second day than on the first day. The two days are just finished, what is the total weight of the fruit? (application of equations, arithmetic, ratios)
一批水果第一天比第二天多买400千克，第二天比第一天少买12.5%，两天恰好买完，求水果的总重？(方程、算术、比的应用)
<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">400 / 0.125</gadget>
<output>3_200</output>

<gadget id="calculator">3_200 - 400</gadget>
<output>2_800</output>

<gadget id="calculator">3_200 + 2_800</gadget>
<output>6_000</output>

<result>6_000</result>