A is 50% as efficient as B.C does half of the work…

A is 50% as efficient as B.C does half of the work done by A and B together .If C along does the work in 40 days then A,B,C together can do the work in?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #39716