exam Maths Puzzle Numerical Ability

Using the numbers 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, find four consecutive numbers whose sum is one half the sum of the other eight numbers.

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exam Other Question

{(2,4),(3,5),(4,6),(5,8)} State whether each relation is a function. The owner of a video store has determined that the cost C, in dollars, of operating the store is approximately given by C(x) = 2x^2 - 28x + 560, where x is the number of videos rented daily. Find the lowest cost to the nearest dollar.