An oculist charges …48.00 for an eye examination, frames, and plastic lenses

An oculist charges $30.00 for an eye examination, frames, and glass lenses, but $48.00 for an eye examination, frames, and plastic lenses. If the plastic lenses cost four times as much as the glass lenses, how much do the glass lenses cost?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · dev #237