exam Maths Puzzle Numerical Ability Age Problem

The product of two consecutive odd whole numbers is 143. Find the numbers

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24 - (-12) = ?????????? How many cubic yards of earth must be removed in digging an artificial lake 15 feet deep,if the level bottom is a rectangle 180 feet by 20 feet and the top is a rectangle 216 feet by 24 feet?Show solution and formulas.