Given: The average of five numbers is 50 and the average of the first three numbers is 35. Formula used: Average = Sum of all terms/Total number of terms Calculation: The average of five numbers = 50 ∴ Sum of all five numbers = 50 × 5 = 250 And, the average of the first three numbers is 35 ∴ Sum of first three numbers = 35 × 3 = 105 Now, sum of last two numbers = 250 – 105 = 145 ∴ Average of last two numbers = 145/2 = 72.5 So, the average of the last two numbers is 72.5.