On the picking festival, Xiaowen and Xiaoliang picked pomegranates, with 3 people in each family. Xiaowen's family picked 42 pomegranates in total, and Xiaoliang's family picked 17 pomegranates on average. How many pomegranates did Xiaowen's family pick less on average than Xiaoliang's family?
采摘节，小文和小亮两家摘石榴，每家3个人．小文家共摘了42个石榴，小亮家平均每人摘了17个石榴．小文家比小亮家平均每人少摘多少个石榴？
<gadget id="calculator">42 / 3</gadget>
<output>14</output>

<gadget id="calculator">17 - 14</gadget>
<output>3</output>

<result>3</result>