document.write( "Question 1168453: If three times a boy’s age is increased by 3, it will equal his sister’s age. The sum of their ages now is 23. How old are the boy and his sister? Let x = boy’s age. 3x + 3 = sister’s age.
\n" ); document.write( "\"+x+%2B+%283x+%2B+3%29+=+23+\"
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Algebra.Com's Answer #793032 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
x, sisters age
\n" ); document.write( "b, boys age
\n" ); document.write( "\"system%283b%2B3=x%2Cb%2Bx=23%29\"\r
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\n" ); document.write( "\n" ); document.write( "You could SUBSTITUTE.
\n" ); document.write( "\"b%2B%283b%2B3%29=23\", essentially where you stopped. No reason to stop. KEEP GOING!\r
\n" ); document.write( "\n" ); document.write( "\"b%2B3b%2B3=23\"
\n" ); document.write( "\"4b%2B3=23\"
\n" ); document.write( "\"4b=20\"
\n" ); document.write( "\"highlight%28b=5%29\"-------------Now you find sister's age.
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