Fourth grade students sign up for the "Journal of Primary School Mathematics". The first class ordered 25 copies, and the second class ordered 20 copies. The first class cost 3.5 yuan more than the second class. How much is each "Journal of Primary School Mathematics"?
四年级学生征订《小学数学报》．一班订了25份，二班订了20份，一班比二班多花了3.5元．每份《小学数学报》多少元？
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">3.5 / 5</gadget>
<output>0.7</output>

<result>0.7</result>