# A student obtained 75%, 80%, 85% marks in three subjects. If the marks of another subject are added then his average marks can not be less than

## Solution :

Total marks obtained from three subjects out of 300 = 75 + 80 + 85 = 240

if the marks of another subject is added then the total marks obtained out of 400 is greater than 240

if marks obtained in fourth subject is 0 then

minimum average marks = $$240\over 400$$$$\times$$100 = 60%

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