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In a town called Hortonville, exactly 648 of the 2,160 residents have a white house. What percentage of the Hortonville residents does NOT have a white house?
The correct answer is H.
The first step in solving this problem is to calculate the percentage of residents who DO have a white house. Set up a proportion:
648 is to 2,160 as x% is to 100%
648/2,160 = x/100
Cross-multiply and solve for x:
2,160x = 64,800
x = 30
30% of the residents have a white house. Therefore, 100% - 30%, or 70% of the residents DO NOT have a white house.