Question 795809
Ann is 2 years older than Mary. Last year Ann was 3 times as old as Mary. How 
old is Ann now? 
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Equations:
a = m + 2
a-1 = 3(m-1)
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Substitute for "a" and solve for "m":
m+2-1 = 3m-3
2m = 4
m = 2 yrs (Mary's age now)
a = m+2 = 4 yrs (Ann's age now)
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Cheers,
Stan H.
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