If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30, what is the average of x and y?

The average of x and y is 95.

Step-by-step explanation:

Given : If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30.

To find : What is the average of x and y?

Solution :

Average is the sum of observation divided by number of observation.

According to question,

Divide equation by 2,

Therefore, the average of x and y is 95.

replace   with   27   and simplify.

10 , 27 , 10 , 70 , 10 , 35 , 10 , 48

step-by-step explanation: