SOLUTION: I'm trying to help my daughter with algerbra and I'm lost too! Here is the problem: A group of ten 6 and 12 volt batteries are wired together. The sum of their voltages is 84 vo

Question 226303: I'm trying to help my daughter with algerbra and I'm lost too! Here is the problem:
A group of ten 6 and 12 volt batteries are wired together. The sum of their voltages is 84 volts. How many of each type of battery are used?
I can get to the answer through process of elimination, but do not know how to set up the problem correctly. Can you help?
Mom
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
if b="number of 6v", then 10-b="number of 12v"

6(b) + 12(10 - b) = 84

distributing ___ 6b + 120 - 12b = 84 ___ -6b = -36 ___ b = 6

six 6v and four 12v
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