Ex: Weighted Average - Determine an Ending Percent or Grade of a Weighted Average

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This video explains how to determine a weighted average and determine a score needed for a given overall average.
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Having TWO different 75/25% in this example problem made it unbelievably difficult for no reason. Because I definitely don't know which 25 you're referring to in the SECOND equation. So now I'm stuck and I can't plug in these numbers for a similar problem I'm currently trying to solve. SMH. thanks so much

shaylamcgrady