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

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Question 221191: a group of ten 6- and 12-volt batteries are wired in series. The sum of their voltages produces a power supply of 84 volts. How many of each type battery are used?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=10, x=10-y
6(10-y)+12y+84
60-6y+12y=84
6y=24
y=4 12 v bat
x=6 6 v bat
6(6)+12(4)=84