Xiaohong has recently become obsessed with checking phone bills. Knowing that her father spent 100 yuan in phone bills in January, and her mother spent 125 yuan in phone bills in January, she asked how much less her father spent than her mother.
小红最近迷上了查话费，已知爸爸一月份花了100元话费，妈妈一月份花了125元话费，问爸爸比妈妈少花多少．
<gadget id="calculator">125 - 100</gadget>
<output>25</output>

<gadget id="calculator">25 / 125</gadget>
<output>1/5 = around 0.2</output>

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