document.write( "Question 844244: 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 years. How old is Sally?
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Algebra.Com's Answer #508637 by stanbon(75887) $\"\"$ $\"About$

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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 years. How old is Sally?
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\n" ); document.write( "Equations:
\n" ); document.write( "s = b - 7
\n" ); document.write( "3b - 2s = 37
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\n" ); document.write( "Substitute for \"b\" and solve for \"s\":
\n" ); document.write( "3(s+7) - 2s = 37
\n" ); document.write( "s + 21 = 37
\n" ); document.write( "s = 16 yrs. (Sally's age now)
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