In Mixed number coding type of questions, a few groups of numbers each coding a certain short message, are given. Through a comparison of the given coded message, taking two at a time, the candidate is required to find the number code for each word and then formulate the code for the message given.
In a certain code, '253' means 'books are old';
'546' means 'man is old' and
'378' means 'buy good books'.
What stands for 'are' in that code ?
In the first and second statements, the commond code digit is '5' and the common word is 'old'.
So, '5' means 'old'.
In the first and third statements, the common code digit is '3' and the common word is 'books'.
So, '3' means 'books'.
Thus, in the first statements, '2' means 'are'.