document.write( "Question 856835: The average age of my family consisting of parents and myself is 30 year. Ten year ago, the average age of my parents were 23year.Find my present age. \n" ); document.write( "
Algebra.Com's Answer #516314 by JulietG(1812)\"\" \"About 
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Let A be your age:
\n" ); document.write( "A + B + C = 90 (3x30, the average age; there are 3 of you)
\n" ); document.write( "(B-10)+(C-10)= 46 (23x2 people), Add 20 to each side, B+C=66
\n" ); document.write( "Substitute the known value of B+C from the second equation into the first equation.
\n" ); document.write( "A + 66 = 90
\n" ); document.write( "Subtract
\n" ); document.write( "A = 90- 66 = 24
\n" ); document.write( ".
\n" ); document.write( "Check my math; I haven't had my coffee yet ;-)\r
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