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SP = 880×0.8 = 704; CP = 704/1.1 = Rs 640. The marked option is Rs 774.
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(1 − 8/x)⁴ = 16/81 ⇒ 1 − 8/x = 2/3 ⇒ x = 24 litres.
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1/20 + 1/24 − 3/C = 1/15 ⇒ 3/C = 1/40 ⇒ C = 120 gallons.
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Q does 10/15 = 2/3. Remaining 1/3 takes P (1/3) × 18 = 6 days.
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Each half lasts 15 min ⇒ total 30 min.
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A record Mersenne prime of the form 2^82,589,933 − 1 was widely cited around 2018.
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