Question

The average of 15 numbers is 18. The average of first 8 is 19 and that last 8 is 17, then
8th number is​

Answer 1

Answer:

18

Step-by-step explanation:

if average of 15 no. = 18

then sum if 15 no. = 15×18= 270

if average of 1st 8 = 19

sum =8×17=152

average of last 8 = 17

sum = 17×8=136

TO FIND 8TH NO.

(136+152)-270

288-270

18