Mr. Zhang buys 3 fountain pens and 6 ballpoint pens, and they share 45 yuan. The unit price of the ballpoint pens is (1/3) of the fountain pen. How much is each pen?
张老师买3支钢笔和6支圆珠笔，共用去45元，圆珠笔单价是钢笔的(1/3)．钢笔每支多少元．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 6</gadget>
<output>2</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>