exam Maths Puzzle Numerical Ability

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?

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exam Other Question

a|bx-c|=d
Solve for x. Assume that a, b, c, and d represent positive real numbers. One number is less than twice another. If the sume of the two numbers is 20 find the number.