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

Algebra ->  Customizable Word Problem Solvers  -> Numbers -> 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      Log On

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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) About Me  (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