The ratio of the three numbers A, B, and C is 2:3:7, the average of the three numbers is 48, what is the number B?
甲、乙、丙三个数的比是2：3：7，三个数的平均数是48，乙数是多少？
<gadget id="calculator">2 + 3 + 7</gadget>
<output>12</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">48 * 3 * (1/4)</gadget>
<output>36</output>

<result>36</result>