exam Maths Puzzle Numerical Ability

The sum of the positive divisors of 480 is 1512. Find the sum of the reciprocals of the positive divisors of 480.

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exam Other Question

An office building has 10,950 square feet of office space, If 3373 square feet are rented, what fractions of the total space is still available? GE = y, EH = y-1, GH = 11