Average marks obtained by 9 students in one row of class is 45.one student with 35 marks exchanges his seat with a student securing 48 marks .what is average marks of these 9 students of this row?
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New average of 9 students is 46 4/9
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total of X =9×45
=405
now new x=405-35+48
=418
average is 418÷9
= 46.44
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