In a row of 36 boys, who are facing north, P is eighth from the right end and there are seven children between L and P. What is L's position from the left end of the row?

Find the missing number.
10, 100, 200, 310, ?

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.

a_c_abb_a_bc_bc_ab 

6 years ago, Raju's age was 2 years less than half of his brother's age, which was 20 years. What is his present age?

find the missing number practice test 
 

Find the missing number?

Choose the correct option from the following options.
8 : 9 ∷ 64 : ?