Solution:
Let Alica's age be represented with x and Aline's age represented with x + 10.
In 12 years:
Add 12 to both ages
Alica's age = x + 12 and Aline's age = (x + 10) + 12 = x + 22
The sum of their ages in 12 years will be 40, so the equation is as follows:
=> x + 12 + x + 22 = 40
=> 2x + 34 = 40
=> 2x = 40 - 34 = 6
or x = 6/2 = 3
So Alica is 3, and Aline is 13 (i.e. 3 + 10).
Solving
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