document.write( "Question 1160731: Gabriella is x years old. her brother is 8 years older and her sister is 12 years younger than she is. If their total age is 50 years, how old are they? \n" ); document.write( "
Algebra.Com's Answer #784126 by saw(34)\"\" \"About 
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Solution.
\n" ); document.write( "Gabriella = x
\n" ); document.write( "Her brother = x+8
\n" ); document.write( "Her sister = x-12
\n" ); document.write( "x+(x+8)+(x-12) = 50
\n" ); document.write( "Remove the parenthesis
\n" ); document.write( "x+x+8+x-12 = 50
\n" ); document.write( "Collect the like terms
\n" ); document.write( "3x+8-12 = 50
\n" ); document.write( "Calculate the difference
\n" ); document.write( "3x-4 = 50
\n" ); document.write( "Move constant to the right
\n" ); document.write( "3x = 50+4
\n" ); document.write( "Add the numbers
\n" ); document.write( "3x = 54
\n" ); document.write( "Divide both sides by 3
\n" ); document.write( "x = 18\r
\n" ); document.write( "\n" ); document.write( "Therefore Gabriella is 18 years old.
\n" ); document.write( "Her brother is (x+8) = 18+8 = 26 years old.
\n" ); document.write( "Her sister is (x-12) = 18-12 = 6 years old.
\n" ); document.write( "Check-----
\n" ); document.write( "x+(x+8)+(x-12) = 50\r
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