<PRE><B>Question 424359</B>
Anna is 12 years old, and her mother is three times as old as Anna. How many years ago was her mother four times as old as Anna?
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Equations:
a = 12
m = 3a = 3*12 = 36
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(m-x)= 4(a-x)
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36-x = 4(12-x)
36-x = 48-4x
3x = 12
x = 4 (# of years ago)
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Cheers,
Stan H.</PRE>