Multiple choice

The average of 5 numbers is 140. If one number is excluded, the average of the remaining 4 numbers is 130. The excluded number is :

  1. 135

  2. 134

  3. 180

  4. 150
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C Correct answer
Explanation

If the average of 5 numbers is 140, their total sum is 5 x 140 = 700. When one number is removed, the average of the remaining 4 numbers is 130, so their sum is 4 x 130 = 520. The excluded number is the difference: 700 - 520 = 180.

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