Question

17 The average of x + 3, x + 6. X + 9 x + 12 and x + 15 is 15. Find the average of first three numbers. e​

Answer 1

Answer:

given

(x+3+x+6+x+9+x+12+x+15)/5=15

therefore after solving we get

x=6

therefore the average of first 3 numbers are=(6+3+6+6+6+9)/3=12..( by putting x=6)