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Given: Number of pumps required to fill a tank in 1.5 hours = 5

To find: Number of pumps require to fill the tank in 0.5 hours

Formula: Substituting x1 = 1.5, y1 = 5 x2 = 0.5 in the formula, Gives y2 = 15 pumps

15 pumps are required to fill the tank in 0.5 hours.

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