There are 50 students in class A, and (2/5) students from class A are selected to participate in the group gymnastics. The number of people selected from class A is exactly half of the number of students selected from class B. To participate in the rehearsal, how many people should be selected from Class B?
甲班有学生50人，从甲班选出(2/5)的人参加团体操，甲班选出的人数刚好是乙班选出人数的一半，如果从乙班选(5/8)的学生参加排练，乙班应选出多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 * (2/5)</gadget>
<output>20</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">40 * (5/8)</gadget>
<output>25</output>

<result>25</result>