SOLUTION: Alexis has taken 3 exams and her average is currently X. On the fourth exam, she scored 20 points higher than her average (so she scored X + 20). How many points did her average
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Question 1004193: Alexis has taken 3 exams and her average is currently X. On the fourth exam, she scored 20 points higher than her average (so she scored X + 20). How many points did her average increase by after this fourth exam?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
average=total/n
x*3=total
fourth test scores (x+20)
new total is 3x+(x+20)=4x+20
Divided by 4, the new n
the average is x+5. Her average increased by 5.
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