There are 15 rows of seats in the lecture theater of Zannan Primary School, with 20 seats in each row. How many seats are there in total?
赞南小学阶梯教室有15排座位，每排20个．一共有多少个座位？
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<result>300</result>