Question

Average of five numbers is 12. But the average of three of these is 10. The average of the rest two numbers is

• A. 15
• B. 20
• C. 17
• D. 18

Answer 1

Answer:

A. 15

Solution: Given: Average of 5 numbers (A1) = 12 Average of 3 of these numbers (A2) = 10 Formulae: Sum = Average × Number of items Average = Sum / Number of items Calculation: Sum1 = A1 × 5 = 12 × 5 = 60 Sum2 = A2 × 3 = 10 × 3 = 30 Sum3 = Sum1 - Sum2 = 60 - 30 = 30 A3 = Sum3 / 2 = 30 / 2 = 15 So, the average of the other two numbers is 15.