Question

Average of 3 numbers is 9.if average of first two number be 12,then find the third number

Answer 1

The third number is 24.

Explanation:

The average of 3 numbers is 9.

∴ The sum of the 3 numbers is = (9×3)

                                                     = 27.

So, the sum of the 3 numbers is 27.

The average of the first 2 numbers is 12.

∴ The sum of the numbers = (12×2)

                                            = 24

∴ The sum of the first 2 numbers is 24.

∴ The third number = (27-24)

                                  = 3

∴ The third number is 3.

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Answer 2

Answer:

3 is answer

Step-by-step explanation:

average of 3 number is 9

sum of 3 nunber = 9*3 =27

average of two number is 12

sum of two number = 12*2 = 24

third number = 27-24 = 3

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