Question

8. The average of three numbers is 12. The 2
numbers are 15 and 10, respectively. What is
the third number?
(A) 11
(B) 12
(C) 13
(D) 14​

Answer 1

Answer:

If the average of the three numbers is twelve then the sum total of the three numbers must equal 36.

If two of the numbers are 15 and 10, and 36 is the sum total of the three numbers, then

36 - [15+10] equals the third number.

= 36 - 25

= 11. The third number

Step-by-step explanation:

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Answer 2

Answer:

(A) 11

Step-by-step explanation:

let the third number be c

therefore

Avg of three numbers can be given by

= (a+b+c)/3

12=(15+10+c)/3

36=25+c

c=36-25

c=11