exam Maths Puzzle Numerical Ability

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...

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solve the equation

e^5x-1 = (e4)^-x 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?