A batch of watermelons is shipped from the fruit shop, and the sold ones are 30 kilograms less than the remaining half, leaving 480 kilograms. How many kilograms are there in total in this batch of watermelons?
水果店运来一批西瓜，卖出去的比剩下的一半少30千克，剩下480千克，这批西瓜共多少千克？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">480 * (1/2)</gadget>
<output>240</output>

<gadget id="calculator">240 - 30</gadget>
<output>210</output>

<gadget id="calculator">210 + 480</gadget>
<output>690</output>

<result>690</result>