In last examination Roger scored marks in each of 5 subjects in the following ratio 4:5:6:7:8 and got an overall score of 72%. If 50% of the maximum marks is passing and the maximum marks of each subject is the same, in how many subjects did Roger fail?
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For ratio and proportion questions, We can always check at first for plugging in values.
Let us assume that for each exam the max score is 100. So total max score in 5 exams is 500
where as Roger scored 72% of 500 which is 360
360 is total marks scored by Roger which is nothing but some of sum of his scores in all subjects
so we have 4a+5a+6a+7a+8a = 360 where "a" is any positive integer, solving for "a", we get 30a= 360 ----> a=12
4a= 48 < 50 and in rest all exams he passed so ans should be A
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