Aunt Wang needs to sew 150 cotton-padded clothes for the people in the disaster-stricken area to spend the winter. She has already finished 90 pieces, and the rest will be finished in 5 days. How many pieces of clothes do she need to sew on average every day?
王阿姨要缝150件棉衣送给灾区的群众过冬，就已经完成了90件，剩下的在5天里完成，平均每天要缝衣服多少件？
<gadget id="calculator">150 - 90</gadget>
<output>60</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<result>12</result>