The gymnasium in the city center originally had 58 rows of seats, and each row of seats can seat 160 people on average; after the reconstruction, it was increased to 98 rows of seats (each row of seats remains unchanged). How many seats have been added after the reconstruction?
市中心体育馆原来有58排座位，平均每排座位可坐160人；改建后增加到98排座位(每排座位不变)，改建后比原来增加了多少个座位？
<gadget id="calculator">98 - 58</gadget>
<output>40</output>

<gadget id="calculator">40 * 160</gadget>
<output>6_400</output>

<result>6_400</result>