There is a batch of gas at the gas station, and when 160 cans are sold, exactly 80% of this batch of gas is sold. How many cans of gas are left at the gas station?
煤气站有一批煤气，售出160罐时正好售了这批煤气的80%，煤气站还剩煤气多少罐？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">160 / (4/5)</gadget>
<output>200</output>

<gadget id="calculator">200 - 160</gadget>
<output>40</output>

<result>40</result>