Question

the average of three number is 11.if the average of the first two number is 12.what is the third number?

Answer 1

Average of three numbers = 11
Therefore, sum of three numbers = 3 × 11 = 33
Average of first two numbers = 12
Therefore, sum of first two numbers = 2× 12 = 24
Therefore, third number = Sum of three numbers - Sum of first two numbers
=) 33 - 24 = 9

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