Xiaoqiang bought 6 ballpoint pens for 9 yuan, and bought the same ballpoint pen for 15 yuan. How many ballpoint pens can he buy?
小强买了6枝圆珠笔用去9元钱，用15元钱买同样的圆珠笔，能买几枝？
<gadget id="calculator">9 / 6</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">15 / (3/2)</gadget>
<output>10</output>

<result>10</result>