RRB Group D Model Paper 8 with solutions

(1) Numbers between 6 and 50 which are divisible by 5 are 10, 15, 20, 25, 30, 35, 40 and 45. So, the average is:

= 27.5
Or,
When numbers are in A.P., we can find out average by dividing sum of first and last numbers by 2, i.e.,
$\frac{10+45}{2}=\frac{55}{2}$ = 27.5