The average (arithmetic mean) of x and y is 20. If z=5,what is the average of x,y and z?​

Question

The average (arithmetic mean) of x and y is 20. If z=5,what is the average of x,y and z?​

Answer 1

Ответ:

15

Пошаговое объяснение:

сумма х + y = 20*2 = 40

сумма x + y + z = 40 + 5 = 45

среднее арифметическое (x+y+z)/3 = 45 : 3 = 15