In an examination, the average score of students in a class who passed is 69 and that of those who failed is 61. If the average score of all the students, who appeared in the examination is 66, then the percentage of students who passed is:
Let's assume the number of students who passed and failed the exam are P and F respectively.
69P+61F = 66(P+F)
69P+61F = 66P+66F
69P-66P =Â 66F-61F
3P = 5F
P : F = 5 : 3
Percentage of students who passed =Â $$\frac{5}{5+3}\times\ 100$$
=Â $$\frac{5}{8}\times\ 100$$
= 62.5%
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