If a is a non-zero natural number, then a > B < C = D should be filled in 0 of a / 18 > A / 25

If a is a non-zero natural number, then a > B < C = D should be filled in 0 of a / 18 > A / 25

If the numerator is the same and the numerator is positive, the smaller the denominator is, the larger the denominator is
Therefore, a > is selected
A/18>A/25