Question

Average of 4 numbers is 15. Fourth number is twice of second number and first number is 1 less than second number and third number is 1 more than the second number. Find the second number.

• A. 16
• B. 11
• C. 12
• D. 24

Answer 1

Answer:

C. 12

Let the second number is x First number = x - 1 Third number = x + 1 Fourth number = 2x Average number = [(x - 1) + x + (x + 1) + 2x]/4 15 = 5x/4 x = (15 × 4)/5 x = 12