Multiple choice

Pritika wrote 5 numbers in a series. The average of first two numbers is 15 and average of last two numbers is 16. If the average of all 5 numbers is 17, then what is the third number?

  1. 52

  2. 33

  3. 23

  4. 21

  5. 17
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C Correct answer
Explanation

Sum of 5 numbers = 5 * 17 = 85. Sum of first two = 2 * 15 = 30. Sum of last two = 2 * 16 = 32. Third number = 85 - (30 + 32) = 85 - 62 = 23.

AI explanation

The total sum of all 5 numbers is 5 multiplied by 17, which equals 85. The sum of the first two numbers is 2 multiplied by 15, equaling 30, and the sum of the last two numbers is 2 multiplied by 16, equaling 32. The third number is the overall total minus the sum of these four numbers, giving 85 minus 30 minus 32, which equals 23.

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