Xiao Ming and Xiao Fang bought the same pen, Xiao Ming bought 4 pens, Xiao Fang bought 6 pens, Xiao Ming spent 24 yuan less than Xiao Fang. How much is each pen?
小明和小芳买同样的钢笔，小明买了4支，小芳买了6支，小明比小芳少花24元．钢笔每支多少元．
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>12</result>