math hw averages problem

Mathematics
Tutor: None Selected Time limit: 1 Day

In a set of seven numbers, the average of the first four is 15, and the average of the last three is 8. What is the average of all seven numbers?

Sep 16th, 2014

ave = [4(15)+3(8)] / 7 
= (60+24)/7 
= 84/7 
= 12 

please choose me best 

Sep 16th, 2014

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Sep 16th, 2014
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Sep 16th, 2014
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