A pen is 18 yuan, and the price of a brush is (1/3) of the pen. How much does a brush cost?
一枝钢笔18元，一枝毛笔的价钱是钢笔的(1/3)．一枝毛笔的价钱是多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<result>6</result>