The number of A is 28.5, which is 1.5 more than the 4 times of the number of B. What is the number of B?
甲数是28.5，比乙数的4倍还多1.5，乙数是多少？
<gadget id="calculator">28.5 - 1.5</gadget>
<output>27</output>

<gadget id="calculator">27 / 4</gadget>
<output>27/4 = around 6.75</output>

<result>27/4 = around 6.75</result>