Xiaogang’s family used up (1/4) of a bottle of cooking oil in 4 days, and used up ((())/(())) of this bottle of oil every day on average. How many days can this bottle of oil be used for?
小刚家4天用去一瓶食用油的(1/4)，平均每天用去这瓶油的((())/(()))，这瓶油能用多少天．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 4</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / (1/16) / 1</gadget>
<output>16</output>

<gadget id="calculator">16 / 1</gadget>
<output>16</output>

<result>16</result>