document.write( "Question 634522: Two seventh of the people in a park are children. There are 45 more adults than children. How many people are there altogether? \n" ); document.write( "
Algebra.Com's Answer #399682 by Maths68(1474)\"\" \"About 
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Let
\n" ); document.write( "Children = c
\n" ); document.write( "Adult = a\r
\n" ); document.write( "\n" ); document.write( "Two seventh of the people in a park are children
\n" ); document.write( "(Adult+children)(2/7)=children
\n" ); document.write( "(a+c)(2/7)=c
\n" ); document.write( "(2)(a+c)/7=c
\n" ); document.write( "(2)(a+c)=c*7.................(1)
\n" ); document.write( "There are 45 more adults than children
\n" ); document.write( "a=c+45.......................(2)
\n" ); document.write( "Substitute the value of a from (2) to (1)
\n" ); document.write( "(2)(a+c)=c*7.................(1)
\n" ); document.write( "(2)(c+45+c)=c*7
\n" ); document.write( "2c+90+2c=7c
\n" ); document.write( "4c+90=7c
\n" ); document.write( "4c-7c=-90
\n" ); document.write( "-3c=-90
\n" ); document.write( "-3c/-3=-90/-3
\n" ); document.write( "c=30
\n" ); document.write( "Put the value of c in (2)
\n" ); document.write( "a=c+45.......................(2)
\n" ); document.write( "a=30+45
\n" ); document.write( "a=75\r
\n" ); document.write( "\n" ); document.write( "Children = c = 30
\n" ); document.write( "Adult = a = 75
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