MCQ Practice Mathematics 📖 If 3a +5b = 10 and 5a + 3b = 30, what is the average (arithmetic mean) of a and b? A 2.5 B 3.5 C 4 D 4.5 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 PreviousFrancis had an average of 75 on her first four Geometry test. After taking the next test her average dropped to 72. How much ... NextIf 6 and x have the same mean as 2, 4 and 24, what is the value of x?
