document.write( "Question 1141697: There is only 12 years difference between Amy and Billy’s ages yet 30 years ago billy was twice Amy’s age what are billy and Amy’s ages now \n" ); document.write( "
Algebra.Com's Answer #762286 by ankor@dixie-net.com(22740)\"\" \"About 
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a = Amy's present age
\n" ); document.write( "b = Billy's
\n" ); document.write( ":
\n" ); document.write( "There is only 12 years difference between Amy and Billy’s ages
\n" ); document.write( "a - b = 12
\n" ); document.write( " yet 30 years ago billy was twice Amy’s age
\n" ); document.write( "a - 30 = 2(b-30)
\n" ); document.write( "a - 30 = 2b - 60
\n" ); document.write( "a = 2b - 60 + 30
\n" ); document.write( "a = 2b - 30
\n" ); document.write( ":
\n" ); document.write( "in the first equation, replace a with (2b-30)
\n" ); document.write( "2b - 30 - b = 12
\n" ); document.write( "2b - b = 12 + 30
\n" ); document.write( "b = 42 is billy's age
\n" ); document.write( "and
\n" ); document.write( "12 + 42 = 54 is Amy's age
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check solutions in the statement
\n" ); document.write( "\" 30 years ago billy was twice Amy’s age\"
\n" ); document.write( "54 - 30 = 2(42-30)
\n" ); document.write( "24 = 12(12)\r
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