The former term of the ratio is expanded to 4 times of the original, and the latter term is expanded to 2 times of the original, what is the ratio.
比的前项扩大到原来的4倍，后项扩大到原来的2倍，比值多少．
<gadget id="calculator">16 / 2 / 4 / 1</gadget>
<output>2</output>

<result>2</result>