document.write( "Question 880944: please help solve this question\r
\n" ); document.write( "\n" ); document.write( "The soccer coach needs new soccer balls he noticed that 6 out of the 10 soccer balls were old. he ordered new ones and has told them that soon 80% of their soccer will be new. How many new soccer balls did he order?
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Algebra.Com's Answer #532369 by richwmiller(17219)\"\" \"About 
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4/10 are new\r
\n" ); document.write( "\n" ); document.write( "Is he replacing old ones with new ones or just adding new ones?
\n" ); document.write( "If he replaced old with new then he bought 4 new ones and threw out 4 old old ones leaving two old ones and 8 new ones.\r
\n" ); document.write( "\n" ); document.write( "If he kept the old ones,
\n" ); document.write( "(4+x)/(10+x)=8/10
\n" ); document.write( "40+10x=80+8x
\n" ); document.write( "2x=40
\n" ); document.write( "x=20
\n" ); document.write( "So if he kept the old ones he bought 20 new ones
\n" ); document.write( "check
\n" ); document.write( "(4+20)/(10+20)=24/30=8/10
\n" ); document.write( "6 of the 30 are still old\r
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