The sum of five numbers is 800

The sum of five numbers is 800. The average of the first two numbers is 100 and the third number is 150. Find the average of the two numbers?

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 #35406