A man weighing 85kg steps on a weighing scale while carring a briefcase. If you the scale reads xkg,frame a formula for the weight W (in kg) of the briefcase.
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wt of briefcase +wt of man= x
then
wt of briefcase=x-wt of man
=(x-85)kg
then
wt of briefcase=x-wt of man
=(x-85)kg
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