exam Maths Puzzle Numerical Ability

A home purchased for $300,000 depreciated 8% over a 1-year period. What was the value of the home after at the end of the year?

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A customer has asked a caterer for 60lbs of nuts, 60% of which are to be cashews. The caterer has available mixtures off 70% cashews and 45% cashews. How many pounds of each mixture should be used? Hello I am not sure how to go about this. If the sides of a square are decreased by 3cm, the area is decreased by 81cm^2. What were the dimensions of the original square. I am thinking (x-3)^2=a-81cm^3, but where do I go from here?