document.write( "Question 276430: Shelly is three years older than Michele. Four years ago the sum of their ages was 67. Find the age of the person now. Can you give me a basic formula to solving most Age Word Problems. \n" ); document.write( "
Algebra.Com's Answer #201446 by stanbon(75887)\"\" \"About 
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Shelly is three years older than Michele. Four years ago the sum of their ages was 67. Find the age of the person now.
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\n" ); document.write( "Equation:
\n" ); document.write( "S = M+3
\n" ); document.write( "(S-4)+(M-4) = 67
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\n" ); document.write( "Modify the 2nd equation:
\n" ); document.write( "S + M = 67+8 = 75
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\n" ); document.write( "Substitute for \"S\" and solve for \"M\":
\n" ); document.write( "M+3 + M = 75
\n" ); document.write( "2M = 72
\n" ); document.write( "M = 36 (Michele's age now)
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\n" ); document.write( "Since S = M+3, S = 39 (Shelly's age now)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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