Question

The average of 3 numbers is 10. If the average of first 2 numbers is 9. Find the third number. *​

Answer 1

12 Ans.

Average of 3 numbers = 10

Sum of 3 numbers = 10×3 = 30

Average of first 2 numbers = 9

Sum of first 2 numbers = 9×2 = 18

Third number = 30-18 = 12

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