There are three cylinders a, b, and c. The base radius of a is (1/2) that of b, which is 2 times that of c; the height of c is 2 times that of a; , is 4 times that of b. Question: How many times is the diameter of the base of b larger than that of a?
a，b，c三个圆柱体，a的底面半径是b的(1/2)，是c的2倍；c的高是a的2倍；，是b的4倍．问：b的底面直径是a的几倍？
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 * (1/2)</gadget>
<output>2</output>

<result>2</result>