In a group of cows and hens, the number of legs are…

In a group of cows and hens, the number of legs are 20 more than twice the number of heads. The number of cows is :

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 #9677