SOLUTION: If I have a 74% in my class and my final coming up is worth 25% of my grade, what is the lowest I can get on my final if I want to keep it above a 70%?

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Question 545018: If I have a 74% in my class and my final coming up is worth 25% of my grade, what is the lowest I can get on my final if I want to keep it above a 70%?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
This is a "weighted average"
{ ( grade #1 )x( it's weight ) + ( grade #2 )x( it's weight ) ] / [ ( total weight ) }
+%28+.75%2A74+%2B+.25x+%29+%2F+1+=+70+
+%28+55.5+%2B+.25x+%29+%2F+1+=+70+
+55.5+%2B+.25x+=+70+
+.25x+=+14.5+
+x+=+58+
The lowest you can get is a 58% on final