Changhong Porcelain Factory produced 600,000 pieces of porcelain in March, which was more (1/4) in February than in March. How many more pieces were produced in February than in March?
长虹瓷厂三月份生产瓷器60万件，二月份比三月份多(1/4)，二月份比三月份多生产多少万件？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 * (1/4)</gadget>
<output>15</output>

<result>15</result>