Answer:
4
Explanation:
You want the least positive integer x such that ...
1/x +9/10 > 4/x
9/10 > 3/x . . . . subtract 1/x
3/10 > 1/x . . . . .divide by 3
x > 10/3 . . . . . multiply by 10x/3
The least positive integer satisfying this requirement is x = 4.