For a certain kind of chocolate, 5 boxes are 50 yuan more expensive than 3 boxes. How much does this chocolate cost per box?
某种巧克力，5盒装的比3盒装的贵50元．这种巧克力每盒售价多少钱？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<result>25</result>