A man has some hens and cows

A man has some hens and cows. If the number of heads be 48 and the number of feet equals 140, then the number of hens will be

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 #6701