document.write( "Question 1010870: A man was 21 years old when his daughter was born. Now he is three times older than his daughter. How old is his daughter now? Write a general function for this.
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Algebra.Com's Answer #626344 by fractalier(6550)\"\" \"About 
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Call the number of years in the future, x.
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\n" ); document.write( "21 + x = 3(x)
\n" ); document.write( "21 = 2x
\n" ); document.write( "x = 10.5
\n" ); document.write( "She is ten and a half years old. He is 31 1/2.
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