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OpenStudy (help!!!!):
the average of 3 numbers is 18. What is 2 times the sum of the 3 numbers?
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OpenStudy (anonymous):
so if (x+y+z)/3 = 18 then (x+y+z)= 54 right cause you move the three over by multiplying both sides of the equation by 3 then you can just 54*2 = 108
OpenStudy (anonymous):
make sense?
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