2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/209889In this paper we consider the congruence equation $q_1 q_2 \equiv c \pmod q$ with $a < q_1 \leq a + q^{1/2+ε}$ and $b < q_2 \leq b + q^{1/2+ε}$ and show that it has solution for almost all $a$ and $b$. Then we apply it to a question of Fujii and Kitaoka as well as generalize it to more variables. At the end, we will present a new way to attack the above congruence equation question through higher moments.12 pages, the author welcomes any ideas on the higher moment attackNumber Theorytext