document.write( "Question 1150851: Charles is four times as old as his daughter Nina.Eight years ago he was ten times as old as Nina. How old is Charles today? \n" ); document.write( "
Algebra.Com's Answer #772378 by MathTherapy(10552)\"\" \"About 
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\n" ); document.write( "Charles is four times as old as his daughter Nina.Eight years ago he was ten times as old as Nina. How old is Charles today?
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My 1st \"let\" statement is usually associated with the variable that's being sought. In other words, here I would say, \"Let Charles' age be C.\"
\n" ); document.write( "But, this would involve FRACTIONS, and that's a topic that most would rather stay away from, you included, I'd assume! So, I'll go with Nina.\r
\n" ); document.write( "\n" ); document.write( "Let Nina's age be N
\n" ); document.write( "Then Charles' is 4N
\n" ); document.write( "We then get: 4N - 8 = 10(N - 8)
\n" ); document.write( "4N - 8 = 10N - 80
\n" ); document.write( "4N - 40N = - 80 + 8
\n" ); document.write( "- 6N = - 72
\n" ); document.write( "N, or Nina's age is: \"matrix%281%2C3%2C+%28-+72%29%2F%28-+6%29%2C+%22=%22%2C+12%29\"
\n" ); document.write( "Therefore, Charles is: \"highlight_green%28matrix%281%2C4%2C+4%2812%29%2C+%22=%22%2C+48%2C+years-old%29%29\" \n" ); document.write( "
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