Percentage Based problems: 
A Student gets an aggregate of 60% marks in five subjects in the ratio
  10:9:8:7:6.If the passing marks are 50% of the maximum marks and each
  subject has the same maximum marks ,in how many subjects did he pass
  the examintation

I have tried:
Consider total mark for each subject as 100



*

*First subject as 10/40*100 = 25

*second subject as  9/40*100 = 22.5

*third subject as  8/40*100 = 20

*fourth subject as  7/40*100 = 17.5

*fifth subject as 6/40*100 =  15


Total Marks obtained by five subject is  100
As per the given data total aggregate marks is 60% is 100

for 100% is 166.66

After that how to proceed what i am doing mistake please anyone guide me for the answer

Based on what you tried, the student had an aggregate score of 20%. Since you want 60%, you would just multiply all of the scores by three, resulting in scores of 75, 67.5, 60, 52.5, and 45.
If 50% is needed to pass an exam, then the student passed 4 out of 5 exams.
