Subject
Bank Exam
Topic
United Commercial Bank Ltd. - Probationary Officer - 2016
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 ?
ক)
7.8খ)
9.8গ)
10.0ঘ)
15Explanation
Solution: প্রশ্নে বলা হচ্ছে যে, 6টি সংখ্যার গড় 8.5. একটি সংখ্যা বাদ দেয়া হলে বাকি সংখ্যাগুলোর গড় হয় 7.2. বাতিল করা সংখ্যাটি কত ছিল ? 6 টি সংখ্যার সমষ্টি = 8.5 6 = 51 এবং 1 টি বাদে বাকি 5 টি সংখ্যার সমষ্টি = 7.2 5 = 36 বাদ দেয়া সংখ্যাটি = 51 - 36 = 15 Shortcut: Discarded number = (8.5 6) - (7.2 5) = 51 - 36 = 15.Related questions
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