Question 987408
.
L=Lacy's age; J=Jack's age=3L
(L-5)+(J-5)=30
(L-5)+(3L-5)=30
4L-10=30
4L=40
L=10 
ANSWER 1: Lacy is 10 years old.
J=3L=3(10yrs)=30 yrs
ANSWER 2: Jack is 30 years old.