Let Kaye's age now = K
Then Cristina's age = 3K -10
In two years we have that
3K - 10 + 2 = 2K simplify
3K - 8 = 2K
3K - 2K =8
K = 8 .....Kaye is 8 yrs old
Check
Cristina's age now = 3(8) -10 = 14
In two years Cristina = 16
And this is twice Kaye's age now