Question 482533
let Millie’s age be represented by _x___ years .
then, Marty's age is __y__ years.
three times Millie's age is 15 years less than twice Marty’s age.

Three times Millie’s age =3x
Twice Marty’s age=2y

Equations

Equation (1)
Sum of Marty’s and Millie’s ages = x+y
Sum of Marty’s and Millie’s ages = 65
x+y=65…………..(1)

Equation (2)
Three times Millie’s age = 15 years less than 2y
3x=2y-15