The average of the two numbers A and B is 8, and the ratio of A and B is 3:5, so what is the number B?
甲乙两个数的平均数是8，甲数与乙数的比是3：5，那么乙数是多少．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">8 * (1/4) * 5</gadget>
<output>10</output>

<result>10</result>