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Thanks very much for your prompt reply. 

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If there were u students at first, the total marks scored was 70u.

The new average was 68 and was given by

( 70u – 98 * 2) / ( u -2 ) = 68        multiply both sides by ( u -2 )

70u – 196 = 68u – 136

2u = 60

u = 30 

So there were 30 students at first. 

 

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