A pencil (2/5) yuan, how much is 3 pencils.
一支铅笔(2/5)元，3支铅笔多少元．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 3</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>