document.write( "Question 755554: john has twin sisters, grace & gina. in four years john will be twice as old as the twins are now. last year grace was 2/3rds of johns age. how old are each of the siblings \n" ); document.write( "
Algebra.Com's Answer #459758 by ankor@dixie-net.com(22740)\"\" \"About 
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john has twin sisters, grace & gina.
\n" ); document.write( "in four years john will be twice as old as the twins are now.
\n" ); document.write( "last year grace was 2/3rds of johns age. how old are each of the siblings
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\n" ); document.write( "let j = John's age
\n" ); document.write( "let t = twin's age
\n" ); document.write( ":
\n" ); document.write( "\"in four years john will be twice as old as the twins are now.\"
\n" ); document.write( "j + 4 = 2t
\n" ); document.write( "j + 4 = 2t
\n" ); document.write( "j = 2t
\n" ); document.write( "j = 2t - 4
\n" ); document.write( ":
\n" ); document.write( "\"last year grace was 2/3rds of johns age.\"
\n" ); document.write( "t - 1 = \"2%2F3\"(j-1)
\n" ); document.write( "multiply both sides by 3
\n" ); document.write( "3(t-1) = 2(j-1)
\n" ); document.write( "3t - 3 = 2j - 2
\n" ); document.write( "3t = 2j - 2 + 3
\n" ); document.write( "3t = 2j + 1
\n" ); document.write( "Replace j with (2t-4)
\n" ); document.write( "3t = 2(2t-4) + 1
\n" ); document.write( "3t = 4t - 8 + 1
\n" ); document.write( "3t = 4t - 7
\n" ); document.write( "7 = 4t-3t
\n" ); document.write( "t = 7 yrs old is the twin's age
\n" ); document.write( ";
\n" ); document.write( "how old are each of the siblings? they're twins they are the same age!
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