exam Maths Puzzle Numerical Ability

The base of a 50 foot ladder is 14 feet from a vertical wall. The ladder slides down so the base is now 30 feet from the wall. How far did the top of the ladder move down the wall?

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exam Other Question

72. A study by Dr. Aaron R. Folsom concluded that waist to hip ratios are a better predictor of 5 year survival than more traditional height to weight ratios. Dr. Folsom concluded Solve each system of equations. Check by substitution

x - y = 3
x + y = -1