document.write( "Question 635384: Billy is 44 and she is twice as old as nina was when billy was as old as Nina is now. How old is nina now? \n" ); document.write( "
Algebra.Com's Answer #400282 by AnlytcPhil(1806)\"\" \"About 
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document.write( "Billy is 44, which is twice as old as Nina was x years ago, which was N-x\r\n" );
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document.write( "44 = 2(N-x)\r\n" );
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document.write( "x years ago, Billy, who is now 44, was 44-x, which is as old as Nina is now, N. \r\n" );
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document.write( "44-x = N\r\n" );
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document.write( "The system of equations is\r\n" );
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document.write( "44 = 2(N-x)\r\n" );
document.write( "44-x = N\r\n" );
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document.write( "Solve that system by substitution and get x = 11, N = 33\r\n" );
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document.write( "Nina is 33.\r\n" );
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document.write( "Checking: 11 years ago Billy was 44-11=33, which is Nina's present\r\n" );
document.write( "age, and Nina was 33-11=22.  So Billy, at 44, is now twice as old as\r\n" );
document.write( "Nina was 11 years ago at age 22.\r\n" );
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document.write( "Edwin
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