exam Maths Puzzle Numerical Ability

(3 and 2 second power) (-4 and 2 second power)

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The sum of the positive divisors of 480 is 1512. Find the sum of the reciprocals of the positive divisors of 480. In a parking garage,there are 20 feet between each level. Each ramp to a level is 130 feet long. Find the measure of the angle of elevation of each ramp.