The length of a rectangle is reduced by 20%

The length of a rectangle is reduced by 20%. By what % would the width have to be increased to maintainthe original area?

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 #221