A double-decker train has 15 cars, each car has 100 seats on the upper deck and 78 seats on the lower deck. How many passengers can this double-decker train carry at a time?
一种双层列车一共有15节车厢，每节车厢的上层有100个座位，下层有78个座位．这种双层列车每次可载客多少人？
<gadget id="calculator">100 + 78</gadget>
<output>178</output>

<gadget id="calculator">178 * 15</gadget>
<output>2_670</output>

<result>2_670</result>