The toy store sold 235 balloons in the morning and 330 balloons in the afternoon, leaving 205. How many balloons were there?
玩具店上午卖出235个气球，下午卖出330个气球，剩下205个，原来有多少个气球？
<gadget id="calculator">235 + 330 + 205</gadget>
<output>770</output>

<result>770</result>