SSAT Math Question 327: Answer and Explanation

Home > SSAT Test > SSAT Math Practice Tests

Test Information

Question: 327

6. If the average of five consecutive whole numbers is 21, what is the greatest number?

  • A. 11
  • B. 19
  • C. 23
  • D. 26

Correct Answer: C

Explanation:

The answer is C

Let x represent the lowest number, and set up the average equation for the five tests: = 21. Combine like terms in the numerator, and multiply both sides by 5: 5x + 10 = 105. Subtract 10 from both sides, and divide both sides by 5: x = 19. As the question asks for the greatest number, add 4 to 19.

The average of five consecutive numbers will be the median of the five numbers: draw five blanks for the five numbers, fill the middle spot with 21, and fill in the next two higher numbers with 22 and 23.

Previous       Next