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  1. Correct Answer: 27 (3/7) hrs Explanation: Let capacity of tank = 12 lit A+B+C per hr = 12/12 = 1 In 3 hrs = 1*3 = 3 Remaining = 12-3 = 9 lit Filled by A+B in 16 hrs Efficiency of A +B = 9/16 Efficiency of C = 1 - 9/16 = 7/16 C will fill full tank in = 12/(7/16) = 192/7 = 27(3/7) hrs

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  2. Correct Answer: 11 Explanation: (25*75*125)*128*(50*100*150) =(5*5*3*5*5*5*5*5)*(2*2*2*2*2*2*2)*(50*100*150) = Pair of (2*5) = 7 zeros and remaining 4 zeros Total = 11 zeros

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  3. Correct Answer: 9m Explanation: Side of base = 24√2/√2 = 24 m Area of base = 24*24 = 576 m² Volume of pyramid = 1728 576*height/3 = 1728 Height = 9 m.

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  4. Correct answer: 150 m² Explanation: Side of base = 10/√2 = 5√2 m Slang height of pyramid = √(10²+ (5/√2)²) = √(225/2) = 15/√2 Area of 1 side surface = 1/2 *(15/√2)*5√2 = 75/2 m² Of all = 4*75/2 = 150 m²

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