The price of 14 pencils is 4.2 yuan, and the price of 10 pencils can buy 3 ballpoint pens. How much is a ballpoint pen?
14枝铅笔的价钱是4.2元，10枝铅笔的钱可以买3枝圆珠笔．圆珠笔多少钱一支？
<gadget id="calculator">4.2 / 14</gadget>
<output>0.3</output>

<gadget id="calculator">10 / 3</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">0.3 * (10/3)</gadget>
<output>1</output>

<result>1</result>