There were 253 people in the skating rink in the morning, 210 people left at noon, and 146 people came. How many people are there now?
溜冰场上午有253人，中午有210人离开，又来了146人，现在场上还有多少人？
<gadget id="calculator">253 - 210</gadget>
<output>43</output>

<gadget id="calculator">43 + 146</gadget>
<output>189</output>

<result>189</result>