If the average marks of three batches of 55, 60 and 45…

If the average marks of three batches of 55, 60 and 45 students respectively is 30, 55, 60, then the average marks of all the students is:

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 #48242