exam Maths Puzzle Numerical Ability

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A professor gives a test with 100 true-false questions. If 60 or more correct is necessary to pass, what is the probability that a student will pass by random guessing?

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the lateral surface area of a right circular cone of base radius r units and height h units is S square units where S= pie r square root of r^2+h^2. solve this formula for h and r. Frank has half of his investments in stock paying an 11% dividend and the other half in a debentured stock paying 13% interest. If his total annual interest is $840, how much does