The integer x is divisible by both 15 and 25

The integer x is divisible by both 15 and 25. Which of the following must be an integer?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #42123