Multiple choice

The average of X1, X2 and X3 is 14. Twice the sum of X2 and X3 is 30. What is the value of X1?

  1. 20

  2. 27

  3. 16

  4. 12
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Given average of X1, X2, X3 is 14, their sum is 42. Twice the sum of X2 and X3 is 30, so X2 + X3 = 15. Therefore X1 = 42 - 15 = 27. This is a simple algebraic problem using the definition of average (sum divided by count) and basic equation solving.

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