Question

The average (arithmetic mean) of 12, 25, and x is 21. What is the value of x?

a. 24
b. 25
c. 26
d. 27

Please explain your answer.

Answer 1

the answer is 26, the average is found by adding all the numbers and dividing by how there are. you are given 2 sets (25,12) and need to find X, the average should be 21. 25+12 is 37, 37+(c) which is 26 = 63 , you then divide 63 by how many numbers you had , which is 3 and the answer is 21.