The average of 45 students in a class is 15 years

The average of 45 students in a class is 15 years. The average age of 25 students is 24. What is the average age of remaining 20 students?

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 #72984