exam Maths Puzzle Numerical Ability

Find two numbers whose sum is 23 and the difference of whose squares is 207

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exam Other Question

Problem: Farmland conversion. The amount of farmland in the United States is decreasing by 1 acre every 0.00876 hours as farmland is being converted to nonfarm use. At what rate in acres per day is the farmland decreasing? 4x to the power of 2 = 13x + 12