A batch of oranges is shipped from the fruit shop, 40% of the total number is sold on the first day, and 140 kilograms are sold on the second day. The weight ratio of the remaining to the sold is 1:3. How many kilograms does this batch of oranges weigh?
水果店运来一批橘子，第一天卖出总数的40%，第二天卖出140千克，剩下的与卖出的重量比是1：3，这批橘子重多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">140 / (7/20)</gadget>
<output>400</output>

<result>400</result>