In a certain game, each of the 5 players received a score between 0 and 100 inclusive. If their average(arithmetic mean) score was 80, what is the greatest possible number of the 5 players who dould have received a score of 50?

- None
- One
- Two
- Three
- Four

i know c but how?

whats the most efficient method to solve this type of the so called , your so "mean" killer question