There is a barrel of oil in the cafeteria, and 3/8 of it has been used up in 3 days. If it continues to be used like this, how many days will it take to use up the rest?
食堂有一桶油，3天用掉了它的(3/8)，如果这样用下去，剩下的还要几天用完？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(3/8) / 3</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(5/8) / (1/8)</gadget>
<output>5</output>

<result>5</result>