The canteen bought back 18 tons of flour, and the rice bought back was less than the flour (1/6). How many tons of rice did the canteen buy back?
食堂买回面粉18吨，买回的大米比面粉少(1/6)，食堂买回大米多少吨？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">18 * (1/6)</gadget>
<output>3</output>

<gadget id="calculator">18 - 3</gadget>
<output>15</output>

<result>15</result>