Question

If the average of x,y and 9is 12 what is the average of x+y,y-6 and 10

Answer 1

Answer:

11

Step-by-step explanation:

Step-by-step explanation: (x+y+9)/3 = 12 solving for (x+y) x+y = 27 -----(1) then, (x+2+y-6+10)/3 = a (x+y+6)= 3a ----(2) substitute the value of x+y from equation (1) into equation (2) solving for value of (a), you get a = 11