document.write( "Question 1135481: Jake is four years older than Erin. Jake is three times as old as Danielle. The sum of their ages is 94. How old is Jake? \n" ); document.write( "
Algebra.Com's Answer #753090 by ikleyn(52794)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "This problem is SIMPLE, and the major step in its solution is to choose the major unknown REASONABLY.\r
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document.write( "Let D be the Daniel age.\r\n" );
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document.write( "Then Jake's age is 3D, according the condition,\r\n" );
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document.write( "     while Eric's age is (3D-4) years.\r\n" );
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document.write( "Now use the info about the sum of their ages.\r\n" );
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document.write( "It gives you an equation\r\n" );
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document.write( "    D + 3D + (3D-4) = 94.\r\n" );
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document.write( "Simplify and solve it\r\n" );
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document.write( "    7D - 4 = 94\r\n" );
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document.write( "    4D = 94 + 4 = 98\r\n" );
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document.write( "     D = \"98%2F7\" = 14.\r\n" );
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document.write( "Thus Daniel is 14 years old;  Jake is 3*14 = 42 years old.\r\n" );
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document.write( "ANSWER.  Jake is 42 years old.\r\n" );
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document.write( "CHECK.  14 + 42 + (42-4) = 94.     ! Correct !\r\n" );
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\n" ); document.write( "\n" ); document.write( "Ideally,  each Math problem you solve in School,  should teach you something useful.\r
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\n" ); document.write( "\n" ); document.write( "    This problem is to teach you to choose the major unknown in a reasonable way . . . \r
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