IBPS Clerk Prelims Model Paper 17

Let the numbers are
x,x+2,x+4,x + 6 and x + 8.
Average =

x+x+2+x+4+x+6+x+8

5

61 x 5 = 5x+20
5x=305-20
5x=285
x=57
First number = 57
Last number = 65
Required difference = 65 - 57 = 8