m = Mimi's age
r = Ronald's age.
m = r + 4 (1)
(m - 5) = 2(r - 5)
m - 5 = 2r - 10
m = 2r - 5 (2)
Equaling 1 and 2
r + 4 = 2r - 5
r = 9 (That's Ronald's age)
Now we replace r = 9 in (1)
m = 9 + 4 = 13 (That's Mimi's age)
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