Bring a batch of fruit. Sell 15% of the total on the first day, sell 240 kg on the second day, and the ratio of the rest to the sold weight is 1:3. How many kilograms is this batch of fruit in total?
运来一批水果．第一天卖出总数的15%，第二天卖出240千克，剩下的与卖出的重量的比是1：3．这批水果共有多少千克？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/4) - (3/20)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">240 / (3/5)</gadget>
<output>400</output>

<result>400</result>