There were 648 tourists on a passenger ship, 124 people disembarked at Jiangyin Wharf, and 402 people boarded again. How many tourists are there on this passenger ship?
一艘客轮上原有游客648人，到江阴码头下船124人，又上来402人，这时这艘客轮上有游客多少人？
<gadget id="calculator">648 - 124</gadget>
<output>524</output>

<gadget id="calculator">524 + 402</gadget>
<output>926</output>

<result>926</result>