Question

If the mean of x. x+2. +4.x+6 and x+8 is 11. what is the average of the last
three numbers?
(1) 1 (2) 13 (3) 14 (4) 15​

Answer 1

Answer:

(x)+(x+2)+(x+4)+(x+6)+(x+8) /5 = 11

5x+20 = 55

5x = 35

x = 7

the numbers are 7,9,11,13,15

average = 11+13+15/3 = 24+15/3

39/3 = 13