তিনটি সংখ্যার গড় হচ্ছে ৬ এবং চারটি সংখ্যার ( পূর্বের তিনটিসহ) গড় হচ্ছে ৮ । চতুর্থ সংখ্যাটির অর্ধেক কত.হবে?
A. 7
B. 8
C. 6
D. 12
সঠিক উত্তরঃ
A.
7
Explanation:
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