document.write( "Question 100627: the sum of three numbers is 20.The second number is 4 times the first, and the sum of the first and third is 8. find the number \n" ); document.write( "

Algebra.Com's Answer #73290 by checkley71(8403) $\"\"$ $\"About$

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x+y+z=20
\n" ); document.write( "y=4x
\n" ); document.write( "x+z=8 or z=8-x
\n" ); document.write( "x+(4x)+(8-x)=20
\n" ); document.write( "x+4x+8-x=20
\n" ); document.write( "4x=20-8
\n" ); document.write( "4x=12
\n" ); document.write( "x=12/4
\n" ); document.write( "x=3 answer
\n" ); document.write( "y=4*3=12 answer.
\n" ); document.write( "z=8-3=5 answer.
\n" ); document.write( "proof
\n" ); document.write( "3+12+5=20
\n" ); document.write( "20=20 \n" ); document.write( "

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