There were 658 tourists in the Science and Technology Park in the morning, and 239 people left at noon. Another 315 people came in the afternoon. How many tourists are there in the garden at this time?
科技园上午有游客658人，中午有239人离去．下午又来了315人，这时园里有游客多少人？
<gadget id="calculator">658 - 239</gadget>
<output>419</output>

<gadget id="calculator">419 + 315</gadget>
<output>734</output>

<result>734</result>