exam Maths Puzzle Numerical Ability

2x _ 3y _ 6 (for x) Linear equation

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Word Problem:
Janice has enough money to purchase pebbles to cover 74 square feet. She wishes to form a border around her pool. The pool measures 25 ft. in length and 10 ft in width. How wide should she make the border
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log2(x+5) - log2(x+1)