a 4 digit number divisible by 7 becomes divisible by 3 when 19 is added to it . the largest such number is :  Choose one:
A) 4461	B) 4473	C) 4479	D) 4487	E) 4491

Rationale: out of all the 5 options , only 4487 is not divisible by 3 . all others are divisible so answer = d ( no further calculation required ) addition of any two non - divisible numbers by 3 gives the resultant divisible by 3 19 is non - divisible by 3 ; we are adding a number to that so that the resultant becomes divisible by 3 applying the above rule , it means that the number which we are going to add should be non - divisible by 3 so comes the answer = 4487 answer : d
Answer: D