Percentage Practice Test 5 with solutions

Question : 36 of 40

Marks: +1, -0

In a Mathematics examination, the average for the entire class was 80 marks. If 10% of the students scored 95% marks and 20% scored 90 marks, what was the average marks of the remaining students of the class?

85
75
72.5
65.5

Validate

Solution:

Let the average marks of the remaining students be x; then

{10× 95+ 20 ×90+ 70× x}/100=80

⇒70x = 8000 - (950 + 1800)

∴x=5250/70=75

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