exam Maths Puzzle Numerical Ability

log base 2 (x+5) + log base 2 (x+2) = log base 2

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exam Other Question

How many ounces of pure gold must be added to five ounces of something that is 1% gold in order that the mixture is 6% gold? Division can be used to show that 7 over 40 can be written as what kind of decimal?