A certain grain store sold 18 tons of flour last week, and sold less rice than flour (1/6). How many tons of rice did the grain store sell last week?
某粮店上周卖出面粉18吨，卖出的大米比面粉少(1/6)，粮店上周卖出大米多少吨？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">18 * (5/6)</gadget>
<output>15</output>

<result>15</result>