First-grade tobacco costs …20 per kilogram

First-grade tobacco costs $30 per kilogram while second-grade tobacco costs $20 per kilogram. If a blend contains only first and second grade tobacco, what must be the percentage of second-grade tobacco so that the blend would cost $22 per kilogram?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #83264