Qiangqiang's height is 1.40 meters, father's height is 1.3 times of Qiangqiang's height, mother's height is 0.9 times of father's height, how many meters is mother's height?
强强的身高是1.40米，爸爸身高是强强的1.3倍，妈妈的身高是爸爸身高的0.9倍，妈妈的身高是多少米？
<gadget id="calculator">1.4 * 1.3 * 0.9</gadget>
<output>1.638</output>

<result>1.638</result>