Question 1085921
P = Paul's current age
M = Mim's current age

P = M-12
P + 23 = 2(M-19)

Set top eqn equal to bottom, to eliminate P:
M-12 = 2M-38-23
     M = -12+38+23 = 49

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Ans:  Mim is currently 49 years old
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Check:   M=49 —> P=37
In 23 years, P=60 and that is 2*(49-19) = 2*(30)   (ok)