The price of a ballpoint pen is (2/5) of a pen, and the price of a pencil is (1/3) of a ballpoint pen. Xiaowei spent 2 yuan on a pencil. How much does it cost to buy a pen? Yuan money?
一支圆珠笔的价钱是一支钢笔的(2/5)，一支铅笔的价钱是一支圆珠笔的(1/3)，小伟买一支铅笔花了2元钱，买一支钢笔花多少元钱？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / (1/3) / (2/5)</gadget>
<output>15</output>

<result>15</result>