The average of 5 numbers is 40. If 2 more numbers, with an average of 21, are added to these numbers, what will be the average of the combined 7 numbers?
A. 8.7
B. 30.1
C. 30.3
D. 34.6
Explanation: প্রথম 5টি সংখ্যার মোট যোগফল \(=5\times40=200\) নতুন 2টি সংখ্যার মোট যোগফল \(=2\times21=42\) মোট 7টি সংখ্যার মোট যোগফল \(=200+42=242\) মোট 7টি সংখ্যার গড় \(=242/7\approx34.57\) সবচেয়ে কাছের বিকল্পটি হলো 34.6
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