The average number of A, B, and C is 28, and the ratio of A, B, and C is 1:2:3. What is the number of B?
甲、乙、丙的平均数是28，甲、乙、丙的比是1：2：3，乙数是多少？
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">28 * 3 * (1/3)</gadget>
<output>28</output>

<result>28</result>