Question

The average of three numbers is 12. If two of the numbers are 6 and 9, find the third​

Answer 1

Answer:

Let the third no. be x.

Then according to question,

(6+9+x)/3 = 12

(15+x)/3 = 12

15+x = 36

x=36-15

x=21

So, 21 is the third number.

Answer 2

Average of three numbers = 12

sum of these numbers = 12 x 3

=36

two of the numbers = 6 and 9

sum of first two numbers = 6 + 9

= 15

• we know total of three and two now subtract

36 - 15 =21

third number 21

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