Xiaoying bought 5 pens for 40 yuan, and Xiaoli bought one pen for 6 yuan. Which one of them bought the cheaper one? How much is it cheaper?
小英买5枝钢笔花了40元，小丽买一枝花去6元，他们谁买的便宜些？便宜了多少元？
<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<result>2</result>