SOLUTION: a group of ten 6 and 12 volt batteries are wired in a series. The sum of their voltages is 84 volts. HOw many type of each battery is used?

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Question 219178: a group of ten 6 and 12 volt batteries are wired in a series. The sum of their voltages is 84 volts. HOw many type of each battery is used?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
6x+12y=84
x+y=10, x=10-y
6(10-y)+12y=84
60-6y+12y=84
6y=24
y=4
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x+y=10
x+4=10
x=6
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6*6+4*12=84