# 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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 Click here to see ALL problems on Numbers Word Problems 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(12657)   (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