document.write( "Question 842506: Sally is Bob's younger sister, and she is 7 years younger than Bob. If you multiply Bob's age by three, and subtract sally's age, you get their mother's age, which is 37. How old is Sally? \n" ); document.write( "
Algebra.Com's Answer #507592 by TheInstructor(29)\"\" \"About 
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Let Bob = x\r
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\n" ); document.write( "\n" ); document.write( "Sally = x-7\r
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\n" ); document.write( "\n" ); document.write( "Multiply Bob's age by 3: 3x
\n" ); document.write( "Subtract Sally's age: 3x-(x-7) = 2x+7\r
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\n" ); document.write( "\n" ); document.write( "2x+7 = 37
\n" ); document.write( "Therefore x= 15\r
\n" ); document.write( "\n" ); document.write( "Bob = 15
\n" ); document.write( "Sally = 8\r
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\n" ); document.write( "\n" ); document.write( "Hope that helped! Feel free to leave a message for any inquiries! =]
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