9.5 is 0.5 less than 4 times the B number, what is the B number?
9.5比乙数的4倍少0.5，乙数是多少？
<gadget id="calculator">9.5 + 0.5</gadget>
<output>10</output>

<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>