The average of 35 students in a class is 18 years

The average of 35 students in a class is 18 years. The average age of 25 students is 20. What is the average age of remaining 10 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 #42320