If the average marks of 1/5 th class is 80% and that of and that of 1/4 th class is 75% and the average marks of the rest class is 65%, then what is the average of the whole class? यदि कक्षा के 1/5 भाग के औसत अंक 80% है और 1/4 भाग का औसत 75% है और शेष भाग का औसत अंक 65% है, तो पूरी कक्षा का औसत क्या है?

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