document.write( "Question 157183: A group of ten 6 and 12 volt batteries are wired in series; the sum of their voltages is 84 volts. How many of each type of battery are used?\r
\n" ); document.write( "\n" ); document.write( "6x + 12x = 84
\n" ); document.write( "18x = 84 does not work \n" ); document.write( "

Algebra.Com's Answer #115839 by oscargut(2103) $\"\"$ $\"About$

You can put this solution on YOUR website!
x=number of 6 volts batteries
\n" ); document.write( "y=number of 12 volts batteries\r
\n" ); document.write( "\n" ); document.write( " $\"6x+%2B+12y+=+84\"$
\n" ); document.write( " $\"x%2By=10\"$
\n" ); document.write( "then
\n" ); document.write( " $\"x%2B2y=14\"$
\n" ); document.write( " $\"-x-y=-10\"$
\n" ); document.write( "then
\n" ); document.write( " $\"y=4\"$
\n" ); document.write( " $\"x=10-4=6\"$ \r
\n" ); document.write( "\n" ); document.write( "Answer: there are 6 (6 Volts) batteries and 4 (12 Volts) batteries \r
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