Average marks obtained by 9 students in ...

Average marks obtained by 9 students in one row of a class is 45. One student with 35 marks exchanges his seat with a student securing 48 marks. What is the average marks of these 9 students of this row?

56.4

46.4

47.6

45.6

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The correct Answer is:

Total markes `= 9 xx 45 = 405`
According to question,
`405 - 35 + 48 = 418`
`:.` Average markes
`=418/9 = 46/4`

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