The price of a fountain pen is 12 yuan, which is 6 yuan more expensive than a ballpoint pen. So, what fraction of the price of a ballball is the price of a fountain pen?
一枝钢笔的价钱是12元，比一枝圆珠笔贵6元．那么，圆珠的价格是钢笔价格的几分之几？
<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">6 / 12</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>