There are 25 boys in Class 1 and 20 girls, how much fewer girls are than boys, and boys are the number of the whole class ((())/(())).
六1班男生有25人，女生有20人，女生比男生少多少，男生是全班人数的((())/(()))．
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">5 / 25</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>