The train has 12 carriages, of which 9 carriages each have 108 seats, and the other 3 carriages have a total of 318 seats. How many seats are there in this train?
火车有12节车厢，其中9节车厢各108个座位，另外3节车厢共318个座位．这列火车一共多少个座位？
<gadget id="calculator">108 * 9</gadget>
<output>972</output>

<gadget id="calculator">972 + 318</gadget>
<output>1_290</output>

<result>1_290</result>