Answer:
6
Step-by-step explanation:
Answer: D-18 years, Joan-41 years
Step-by-step explanation:
Given
The Sum of Debbie and Joan's age is 59
Take x and y as the age of Debbie and Joan
In 5 years, twice Debbie's age will be equal to Joan's age


Also, 
solving these two equations we get

For the first one, I believe I is 1200
I think it might be 18 sorry if im wrong