In certain code, 253 means 'books are old', 546 means 'man is old' and 378 means 'Buy good books' what stand for 'are' in the code ?

2

1. 253 means 'books are old'

2. 546 means 'man is old'

3. 378 means 'Buy good books' 

Old is word is common in equation 1 and 2 and similarly 5 is common in equation 1 and 2.

So, 5 stands for old

Books word is common in equation 1 and 3 and similarly 3 is common in equation 1 and 3 .

So, 3 stands forBooks  .

In equation 1 only are is left , which stands for 2.

Ans :- (A) 2