Question

out of eight numbers,the sum of first number is 8 times the 8th number. if their averages is 153 ,then the 8 th number is .​

Answer 1

Sum of 8 numbers =25×8=200…….(1)

Given: 6th number =7th-4 =8th-6 …..(2)

Let the 8th that is,last number =x

So,using (2); 6th number=x-6

and 7th number=x-6+4=x-2

Now,20×2 + 26×3 +(x-6)+(x-2)+x =200 {From (1)

=>40+78+3x-8=200

=>3x+110=200=>3x=90=>x=30