SOLUTION: If i have an average of 78% and I need an average of 80% how many marks out of 60 do i need to get in my exam? The exam is worth 25%

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Question 816201: If i have an average of 78% and I need an average of 80% how many marks out of 60 do i need to get in my exam? The exam is worth 25%
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

have an average of 78% and I need an average of 80%,exam(60 marks) is worth 25%

Let x represent % score of final

 .75*78 + .25x = 80

      x = %2880+-+58.50%29%2F.25

       x = 86% on final exam  and .86%2A60+=+51.60 52 marks correct