There is a barrel of oil weighing 17 catties, and the barrel weighs 1 catty. After half of the oil is used up, how many catties of oil are left?
有一桶油连桶称重17斤，油桶重1斤，用去一半油后还剩几斤油？
<gadget id="calculator">17 - 1</gadget>
<output>16</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">16 * (1/2)</gadget>
<output>8</output>

<result>8</result>