There are two five digit numbers, one is more than 80000, and the other is less than 80000. Rounding to 10000, they are all about 80000, and the difference is 5. How many pairs of such five digit numbers are there I'm in a hurry

There are two five digit numbers, one is more than 80000, and the other is less than 80000. Rounding to 10000, they are all about 80000, and the difference is 5. How many pairs of such five digit numbers are there I'm in a hurry

80001,79996
80002,79997
80003,79998
80004,79999
There are four pairs of such five digits