2014-11-28 09:00:25

If the average of a, b, and 40 is 72, what is the average of a, b, and 82?

The correct answer is 86
Explanation: Average is calculated by taking the sum of the terms and dividing it by the number of terms. Start by finding the sum of a and b by using the formula:

(a + b + 40)/3 = 72.

This means that a + b + 40 = 216 and that a + b = 216 - 40 = 176.

The average of a, b, and 82, then, will be (176 (which is the same as a + b) + 82)/3:

176 + 82 = 258

258/3 = 86