book Maths Puzzle Numerical Ability

What is the answer to logx125=3

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A mixture of 30 lbs. of candy sells for $1.10 a pound. The mixture consists of chocolates worth $1.50 a pound and chocolates worth 90¢ a pound. How many pounds of each kind were used to make the mixture? d=s+0.05s sq .Find d if s=30 .Find d if s=60