Question 1012035
Let Katrina's age be K, and Nico's age be N.

Katrina's age is twice of Nico's. K=2N
The sum of their ages is 36. K+N=36.

You can use substitution to get 2N+N=36 3N=36 N=12

We plug it back in to get Katrina's age. K=2N K=2(12) K=24.


Katrina's 24, Nico's 12.