The length of a rectangle is reduced by 30%

The length of a rectangle is reduced by 30%. By what % would the width have to be increased to maintain the 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 #54978