Multiple choice

The average of five results is$46$ and that of the first four is $45$, fifth result is ?

  1. $12.5$
  2. $10$
  3. $1$
  4. $50$
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D Correct answer
Explanation

The sum of five results is 5 x 46 = 230. The sum of the first four is 4 x 45 = 180, so the fifth result is 230 - 180 = 50.

AI explanation

Using the basic average formula, the total sum of all five results is 5 multiplied by 46, which equals 230. The sum of the first four results is 4 multiplied by 45, which is 180. Subtracting 180 from 230 gives the fifth result as 50.

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