Xiaohong is 1.25 meters tall. When she stands on a 0.5-meter chair, she is 0.09 meters taller than her mother. How tall is her mother?
小红身高1.25米，她站在0.5米的椅子上时，比妈妈高0.09米，妈妈身高多少米？
<gadget id="calculator">0.5 - 0.09</gadget>
<output>0.41</output>

<gadget id="calculator">1.25 + 0.41</gadget>
<output>1.66</output>

<result>1.66</result>