Question 805220
Let x =  the probability that a new restaurant opened in a low population density area will succeed.
%SLDAR = Percent successful low density area restaurants
%SHDAR = Percent successful high density area restaurants
%SLPDAR + %SHDAR = Overall successful new restaurants
.6x+(.4*.6)=.3
.6x+.24=.3
.6x=.06
x=0.1=10%  the probability that a new restaurant opened in a low population density area will succeed.
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Ed