exam Maths Puzzle Numerical Ability

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

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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? Given triangle ABC similar to triangle DEF. If AB= 3 1/2 and DE=8 3/4, what is the ratio of the altitudes to the longest sides?