Sagot :
if rounded to the first digit, you can choose:
18.56
18.57
18.58
18.59
18.56
18.57
18.58
18.59
The are infinitely many such numbers.
Few examples:
18.57
18.5901
18.5566666
18.580000000000003
Few examples:
18.57
18.5901
18.5566666
18.580000000000003