MCQ Practice Mathematics 📖 If the sum of (8, 5 and x) is 21, then the average of (8, 5 and x) is-- A 2 B 3.5 C 7 D 9 Favorite Practice Add to Book Explanation & Answer Detailed explanations and answers are restricted. Unlock full access by logging in to your account. 🔒 Unlock the detailed explanation and answers Log In / Sign Up PreviousIf the sum of (3, 7 and x) is 18, then the average of (3, 7 and x) is-- NextIf Tk.45000 was invested in the share market when the price per share was Tk.90 and Tk.30000 was invested when the price per ...