कितने रैप्स करें मसल्स बढ़ाने और फैट घटाने के लिए

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The mean of 10 numbers is 12.5. The mean of first six numbers is 15 and the mean of last five numbers is 10. Find the sixth number.

Continue reading “The mean of 10 numbers is 12.5. The mean of first six numbers is 15 and the mean of last five numbers is 10. Find the sixth number.”

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