51) X is mightier than Y and Y is mightier than Z. P is mightier than Q but inferior to Y. Q is mightier than Z. Who is the weakest among all?

52) If each of the digits in the number '92581473' are arranged in ascending order what will be the difference between the digits, which are fourth from the right and third from the left in the new arrangement?

53) In a certain code, EAT is written as 318 and CHAIR is written as 24156. How will TEACHER be written in that code?

54) If NOIDA is written as 39658, how will INDIA be written?

55) In a certain code language, '253' means 'books are old', '546' means 'man is old' and '378' means 'buy good books'. What stands for 'are' in that code?