Question

A four digit number divisible by 7 becomes divisible by 3 when 10 is added to it. The largest such number is how much

Answer 1

The no. is 9989

9989/7 = 1427

9989 + 10 = 9999

9999/3 = 3333

Answer 2

If the 4 digit number is multiple of 3 then by adding ( not a multiple of 3) there will not be a number which is divisible by 3.

So it is clear that out four digit number is not a multiple of the number 3.

So from the options that you're given, choose the one which is not a multiple of 3.

So the largest such number of 9989.