In a ratio, both internal terms are (1/4), one of the external terms is the smallest prime number, and the other external term is how much.
在一个比例里，两个内项都是(1/4)，其中一个外项是最小的质数，另一个外项是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 2</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) * (1/8)</gadget>
<output>1/32 = around 0.03125</output>

<result>1/32 = around 0.03125</result>