The average of 4 consecutive numbers is 64.5. What is the largest number among these numbers?

62 60 67 66

66

Sum of 4 consecutive numbers = 4 × 64.5 = 258 let first number =  a a + ( a+1) + (a+2) + (a+3) = 258 4a = 258 - 6 = 252 a = 63 Largest number = a + 3 = 63 + 3 = 66