The ratio of the number of people in class A to class B is 2:3, if there are 40 people in class A, how many people are there in class B?
甲班与乙班人数比为2：3，如果甲班有40人，则乙班有多少人？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<result>60</result>