In an exam, Ajith, Sahu, Karun, Sandeep and Rajesh scored an average of 45 marks. Sandeep scored 10 marks more than Ramesh. Ramesh scored 5 fewer than Ajith. Sahu scored as many as Sandeep and Ramesh scored.Sahu and Karun scored 120 marks them. If Ajith scores 30 marks then how many marks did Karun score?