The difference between a number and its two-fifth is 510

The difference between a number and its two-fifth is 510. What is 10% of that number ?

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 #7342