Xiao Ming is 140 cm tall. When he stands on a 0.7-meter-high stool, he is 0.3 meters taller than his father. How many meters is his father's height?
小明身高140厘米，他站在0.7米高的凳子上时，比爸爸高0.3米，爸爸身高多少米？
<gadget id="calculator">140 / 100</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">0.7 - 0.3</gadget>
<output>0.4</output>

<gadget id="calculator">(7/5) + 0.4</gadget>
<output>1.8</output>

<result>1.8</result>