The price of a pen is exactly equal to the price of 6 ballpoint pens, and the price of one ballpoint pen can buy exactly 2 pencils. It is known that a pencil costs 50 cents, how much is a pen?
一支钢笔的价钱正好等于6支圆珠笔的钱，一支圆珠笔的钱正好可以买2支铅笔，已知一个铅笔5角钱，一支钢笔多少钱？
<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

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

<result>6</result>