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?
I tried using the table method. I have 5 oz and need

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exam Other Question

Peter plans to fence off a square feed lot and then cross-fence to divide the feed lot into four smaller square feed lots. If he uses 480 ft of fencing, then how much area will be filled in?
The answer in the back of the book is 6400ft squared. I am in need of help

Solve by using the quadratic formula X^2=5x+8

Thank you