Problema Solution
katerina is twice as old as her friend Antonella. Antonella is 5 years older than Sofia. in 5 years, katerina will be three times as old as Sofia. How old is Antonella now?
Answer provided by our tutors
Let x = Antonella's age.
Then katerina's age is 2x.
Sofia's age is x-5.
in 5 years, katerina will be three times as old as Sofia:
2x+5 = 3(x-5 + 5)
2x+5 = 3x
5 = 3x -2x
x=5
ans: 5