Multiple choice

The average of twenty five numbers is 35 and that of twenty seven numbers is 20. Find the approximate average of all the numbers.

  1. 40

  2. 24

  3. 27

  4. 30

  5. None of these
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C Correct answer
Explanation

Sum1 = 25 * 35 = 875. Sum2 = 27 * 20 = 540. Total sum = 1415. Total count = 52. Average = 1415 / 52 approx 27.2.

AI explanation

The sum of the first twenty five numbers is 25 multiplied by their average of 35, yielding a sum of 875. The sum of the twenty seven numbers is 27 multiplied by their average of 20, yielding a sum of 540. The combined sum of all fifty two numbers is 875 plus 540, which equals 1415. The approximate average of all the numbers is 1415 divided by 52, which results in 27.

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