A batch of watermelons shipped from the fruit shop, sold 20% of the total on the first day, and 3/8 of the total on the second day, and sold 350 kg more on the second day than on the first day. This batch of watermelons originally had a total of How many tons?
水果店运来一批西瓜，第一天卖出总数的20%，第二天卖出总数的(3/8)，第二天比第一天多卖出350千克，这一批西瓜原来共有多少吨？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/8) - (1/5)</gadget>
<output>7/40 = around 0.175</output>

<gadget id="calculator">350 / (7/40) / 1_000</gadget>
<output>2</output>

<result>2</result>