If the average (arithmetic mean) of 2, 7, and x is 12, what is the value of x?

We must remember that the average or arithmetic mean is simply the sum of the numbers divided by the total amount of number. That is:

Average = (2 + 7 + x) / 3 = 12

9 + x = 36

x = 27

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: