exam Maths Puzzle Numerical Ability

A circular pond 26 yd in diameter is surrounded by a gravel path 2 yd wide. The path is to be replaced by a brick walk costing $50 per square yard. How much will the walk cost?

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A company makes three types of backpacks for a cost of $754 for 100 backpacks. Production costs for the three types are $5, $8, and $12. They sell for $20, $30, and $50 respectively. How many of each type are made if the profit is $2226? Factor. 25x^2-90x+81