document.write( "Question 159039: Please help me solve this word problem: Mark is 11 years older that his sister. In 8 years he will be twice as old as she will be then. How old are they now?
\n" ); document.write( "Here's what I have so far: m=s+11+2s+8. Please help. \n" ); document.write( "
Algebra.Com's Answer #117132 by nerdybill(7384)\"\" \"About 
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Mark is 11 years older that his sister. In 8 years he will be twice as old as she will be then. How old are they now?
\n" ); document.write( "Here's what I have so far: m=s+11+2s+8.
\n" ); document.write( ".
\n" ); document.write( "Let x = age of sister
\n" ); document.write( "then because \"Mark is 11 years older that his sister.\"
\n" ); document.write( "x+11 = age of Mark
\n" ); document.write( ".
\n" ); document.write( "From: \"In 8 years he will be twice as old as she will be then.\"
\n" ); document.write( "we get our equation of:
\n" ); document.write( "(x+11) + 8 = 2(x+8)
\n" ); document.write( "x + 11 + 8 = 2x + 16
\n" ); document.write( "x + 19 = 2x + 16
\n" ); document.write( "x + 3 = 2x
\n" ); document.write( "3 years = x (Mark's sister's age)
\n" ); document.write( ".
\n" ); document.write( "Mark's age:
\n" ); document.write( "x+11 = 3+11 = 14 years (Mark's age)\r
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