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The average marks of sammer decreased by...

The average marks of sammer decreased by 1, When he repalced the subject in which he has scored 40 marks by the other two subjects in which he has just scored 23 and 25 marks respectively. Later he has also included 57 marks of computer science then the average marks increased by 2. how many subjects were there initially?

A

6

B

12

C

15

D

can't be determined

Text Solution

Verified by Experts

The correct Answer is:
C
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