SOLUTION: if 70% of my grade is a 97, what does the other 30% need to be to add up to a grade of 90?

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Question 139581: if 70% of my grade is a 97, what does the other 30% need to be to add up to a grade of 90?
Answer by Edwin McCravy(20059) About Me  (Show Source):
You can put this solution on YOUR website!
if 70% of my grade is a 97, what does the other 30% need to be to add up to a grade of 90? 

70% of 97 plus 30% of X = 100% of 90.

         .70%2897%29+%2B+.30X+=+1.00%2890%29
            67.9+%2B+.3X+=+90
                .3X+=+90+-+67.9
                .3X+=+22.1
               %28.3X%29%2F.3+=+22.1%2F.3
                 x+=+732%2F3

Edwin