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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13/15 - 11/20 =
Help again please, just need to no how to do these again. My mind is not of any help need proffesionals... how to solve 2/3 + X/5 < 4/15