document.write( "Question 364421: At a picnic, the ratio of adults to children was 7 : 4.There were 15 more adults
\n" ); document.write( "than children. How many people were at the picnic? \n" ); document.write( "

Algebra.Com's Answer #259869 by Fombitz(32388) $\"\"$ $\"About$

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Let A be the number of adults, C children.
\n" ); document.write( "1. $\"A%2FC=7%2F4\"$
\n" ); document.write( "2. $\"A=15%2BC\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"4A=7C\"$
\n" ); document.write( "From eq. 2,
\n" ); document.write( " $\"4A=60%2B4C\"$
\n" ); document.write( "Substitute from eq. 1,
\n" ); document.write( " $\"7C=60%2B4C\"$
\n" ); document.write( " $\"3C=60\"$
\n" ); document.write( " $\"highlight%28C=20%29\"$
\n" ); document.write( "Then from eq. 2,
\n" ); document.write( " $\"A=15%2B20\"$
\n" ); document.write( " $\"highlight%28A=35%29\"$ \n" ); document.write( "

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