There are 45 students in Class 1 of the fifth grade, including 25 boys, and how many fewer girls than boys.
五年级一班有45人，其中男生有25人，女生比男生少多少．
<gadget id="calculator">45 - 25</gadget>
<output>20</output>

<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>