Kobayashi bought a ballpoint pen and a fountain pen for 12 yuan. The unit price of the ballpoint pen is 1/5 of that of the fountain pen. How much is a ballpoint pen?
小林买了一支圆珠笔和一支钢笔共用去12元，圆珠笔的单价是钢笔的(1/5)，一支圆珠笔多少元．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">12 / (6/5)</gadget>
<output>10</output>

<gadget id="calculator">10 * (1/5)</gadget>
<output>2</output>

<result>2</result>