There were 205 tourists on a passenger ship, 79 people disembarked halfway, and 128 people came up again. How many people are on board at this time?
一艘客轮原有游客205人，中途有79人下船，又上来128人．这时客轮上有多少人？
<gadget id="calculator">205 - 79</gadget>
<output>126</output>

<gadget id="calculator">126 + 128</gadget>
<output>254</output>

<result>254</result>