Solve the column equation: 6 times the number A is equal to half of the number B. If the number A is 15, what is the number B?
列方程求解：甲数的6倍等于乙数的一半，甲数是15，则乙数是多少？
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">90 / (1/2)</gadget>
<output>180</output>

<result>180</result>