There are a total of 620 seats in the 4 rows of the cinema, and 162 seats in the first three rows. How many seats are there in the fourth row?
电影院4排一共有620个座位，前三排各有162个座位，第四排有多少个座位？
<gadget id="calculator">162 * 3</gadget>
<output>486</output>

<gadget id="calculator">620 - 486</gadget>
<output>134</output>

<result>134</result>