There are 18 peach trees in the orchard, and there are fewer pear trees (1/6) than peach trees. How many pear trees are there?
果园里有桃树18棵，梨树比桃树少(1/6)，梨树有多少棵？
<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>