document.write( "Question 685095: if father is 4 time older from daughter, and 6 years back he was 10 time older what is his age? \n" ); document.write( "

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if father is 4 time older from daughter, and 6 years back he was 10 time older what is his age?
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\n" ); document.write( "f = father's age, d = daughter's
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\n" ); document.write( "4 times older = 5 times as old
\n" ); document.write( "now:
\n" ); document.write( "f = 5d
\n" ); document.write( "6 yrs ago:
\n" ); document.write( "f-10 = 11*(d-10)
\n" ); document.write( "f-10 = 11d - 110
\n" ); document.write( "f = 11d - 100
\n" ); document.write( "Sub for f
\n" ); document.write( "5d = 11d - 100
\n" ); document.write( "-6d = -100
\n" ); document.write( "d = 16 2/3 years
\n" ); document.write( "f = 83 1/3 years
\n" ); document.write( "-------------------
\n" ); document.write( "The answers are not integers because you're expected to think that \"4 times older\" means 4 times as old.
\n" ); document.write( "It does not.
\n" ); document.write( "Using %ages, if something is 100% older --> 2x as old.
\n" ); document.write( "1 time older = 2 times as old.
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\n" ); document.write( "Tell the teacher the author of the textbook should find a different line of work. \n" ); document.write( "

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