Question 789830
on a geography quiz, emily and katherine scored an average of 80 points. if katherine and julia scored an average of 85 points how many more points did juila earn than emily?
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let k=what Katherine scored
let e=what Emily scored
let j=what Julia scored
..
(k+e)/2=80
(k+j)/2=85
..
k+j=170
k+e=160
subtract:
j-e=10
points juila earn more than emily=10 (ans b)