Yes I belive so you can try it out
Answer:

Explanation:
Diana's age is d.
Carol is 3 years younger than half of her sister Diana's age.
Carol's age =
Where d is Diana's age.

Hence, Carol's age is
.
I dont understand taht to be honest but if i did i wouldve answered them for you
3 7 and 4 also 5 it makes sense