There were 668 tourists in Xiamen Garden Expo Garden in the morning, 159 people left at noon, and 248 people came in the afternoon. How many people are there in Garden Expo now?
厦门园博苑上午有游客668人，中午离开了有159人，下午又来了248人．现在园博苑共有多少人？
<gadget id="calculator">668 - 159</gadget>
<output>509</output>

<gadget id="calculator">509 + 248</gadget>
<output>757</output>

<result>757</result>