document.write( "Question 6559: a boy is 5 years old, and his sister is twice as old. when the boy is 8 years, what will be the age of his sister? \n" ); document.write( "
Algebra.Com's Answer #3569 by ichudov(507)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "the boy is 5 years old.\r
\n" ); document.write( "\n" ); document.write( "the sister is twice that old, that is, 10 years old. \r
\n" ); document.write( "\n" ); document.write( "the boy will be 8 years in 8-5 years, or in three years. \r
\n" ); document.write( "\n" ); document.write( "After three years, the 10 year old sister will become 13 year old.
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