document.write( "Question 1105954: I am 6 years older than my sister. my brother is 6 years older than i am. the sum of our ages is 72 years. how old is my sister
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Algebra.Com's Answer #720871 by greenestamps(13200)\"\" \"About 
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\n" ); document.write( "You are 6 years older than your sister and 6 years younger than your brother.
\n" ); document.write( "That means your age is the average of the three ages.
\n" ); document.write( "If the sum of the three ages is 72, then the average age is 72/3 = 24.
\n" ); document.write( "So your age is 24; that means your sister's age is 18.
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