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SAT MATH Set 1 Flashcards | StudBud
SAT MATH Set 1
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If x is the mean of m & 9, y is the mean of 2m & 15, and z is the mean of 3m & 18,find the mean of x, y,z in terms of m.
A
m+7
B
2m+14
C
3m+21
D
m+6
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