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The average of 6 numbers is 8.5. When one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number?

The average of 6 numbers is 8.5. When one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number? Correct Answer 15

6 টি সংখ্যার সমষ্টি (8.5×6) = 51 বাকি ৫ টি সংখ্যার সমষ্টি (7.2×5) = 36 ∴ বাদ দেয়া সংখ্যাটি হলো (51 - 36) = 15

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