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. 
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Equation:
S = M+3
(S-4)+(M-4) = 67
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Modify the 2nd equation:
S + M = 67+8 = 75
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Substitute for "S" and solve for "M":
M+3 + M = 75
2M = 72
M = 36 (Michele's age now)
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Since S = M+3, S = 39 (Shelly's age  now)
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Cheers,
Stan H.