The average mark of the students of a class in a particular…

The average mark of the students of a class in a particular exam is 90. If 3 students whose average mark in that exam is 40 are excluded, the average mark of the remaining will be 95. Find the number of students who wrote the exam?

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 #29356