Verbal Reasoning - Mental Ability Questions

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

12 x 6 ÷ 5 + 4 = ?

If "#" means "subtraction", "&" means "division", "@" means "addition" and "%" means "multiplication", then 8442 & 9 # 7 % 6 @ 4 = ?

If WORK = 7935, ROCK = 3587 and WART = 1945, which digit stands for T?

If 30%6 = -5, 10%5 = -2 and 10%2 = -5, then find the value of 80%8 = ?

 In a row of boys, Rahul’s position from the right end is 39th and Pankaj’s position from the left end is 53rd. After interchanging their position, Rahul’s position becomes 64th from the right end. How many boys are there in the row?

Find the missing number ?

Karan's number in the queue is twelfth from the counter. There are five people between Karan and Sunil. What is Sunil's number in the queue?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it? 

p_r_s_q_p_rs