A batch of watermelons is shipped from the fruit shop, and 1/8 of the total number is sold on the first day, and 45 kg more than on the first day is sold on the second day. At this time, the ratio of the sold to the remaining is 5:11. How many kilograms is a batch of watermelon?
水果店运来一批西瓜，第一天卖出总数的(1/8)，第二天比第一天多卖出45千克，这时卖出的与剩下的比是5：11，这批西瓜有多少千克？
<gadget id="calculator">5 + 11</gadget>
<output>16</output>

<gadget id="calculator">5 / 16</gadget>
<output>5/16 = around 0.3125</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(5/16) - (1/8) - (1/8)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">45 / (1/16)</gadget>
<output>720</output>

<result>720</result>