Question 1109761
sum of joe and sheilas ages is 115. 14 years ago joe was twice as old as shiela. How old is sheila now? 
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Equations:
J + S = 115
J-14 = 2(S-14)
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J + S = 115
J -2S = -14
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Subtract and solve for "S"::
3S = 129
S = 43 yrs
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Cheers,
Stan H.
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