and B take a taxi together when they go to work. The two agree that the fare will be divided in proportion according to the distance each person takes. After paying 15 yuan for the fare, how much should A give B?
甲、乙两人上班时合乘一辆出租车，两人商定，车费根据每人乘坐的路程按比例分摊，在全程的(1/2)处，甲先下了车，乙坐完全程付了15元车费，甲应该给乙多少元．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>