Question 1195852
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A good problem to solve in your head.   

The algebraic formulation is:
A = Anna's age now
M = Mica's age now

A = 3M            (1)
A + 3 = 2(M+3)    (2)

Substitute 3M for A and expand Right Hand Side (RHS):
3M + 3 = 2M + 6
M = 3  -->   Mica is 3, Anna is 3*3 = 9