document.write( "Question 786564: Bill and Mark have a combined mass of 85kg. Marks mass is 20kg less than twice Bills mass. What is each boys mass. Write equation. Write bills mass. Write marks mass \n" ); document.write( "

Algebra.Com's Answer #477902 by josmiceli(19441) $\"\"$ $\"About$

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(1) $\"+b+%2B+m+=+85+\"$
\n" ); document.write( "(2) $\"+m+=+b+-+20+\"$
\n" ); document.write( "Substitute (2) into (1)
\n" ); document.write( "(1) $\"+b+%2B+%28+b+-+20+%29+=+85+\"$
\n" ); document.write( "(1) $\"+2b+-+20+=+85+\"$
\n" ); document.write( "(1) $\"+2b+=+105+\"$
\n" ); document.write( "(1) $\"+b+=+52.5+\"$
\n" ); document.write( "and, since
\n" ); document.write( "(2) $\"+m+=+b+-+20+\"$
\n" ); document.write( "(2) $\"+m+=+52.5+-+20+\"$
\n" ); document.write( "(2) $\"+m+=+32.5+\"$
\n" ); document.write( "Bill weighs 52.5 kg
\n" ); document.write( "Mark weighs 32.5 kg
\n" ); document.write( "------------------
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+b+%2B+m+=+85+\"$
\n" ); document.write( "(1) $\"+52.5+%2B+32.5+=+85+\"$
\n" ); document.write( "(1) $\"+85+=+85+\"$
\n" ); document.write( "OK \n" ); document.write( "

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