GMAT Official Advanced Questions: Video Explanations
This page organizes playlists of video explanations to the 150 quantitative problems in the GMAT Official Advanced Questions Guide that was released in September 2019.
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Problem Solving(page 7)

Data Sufficiency (page 20)

Hi,
I couldn’t find Qn 50 of the book (Problem Solving) which starts as – ” A factory assembles..”
Thanks,
Prashant