Rating query

Hey…I solved 2 questions in June long challenge…But my rating is decreased, why?

https://www.codechef.com/ratings
Your rating depends on your rank. Your rank last month was better than in june long challenge (irrespective of how many questions you solved) . Click on the link above to know about the rating mechanism of Codechef .

Because the first 5 were really simple.

Okay, thank you