Hello,

From the first case, we can conclude that the girls are placed as per the following :

_ _ U _ _ _ R or U _ _ _ R _ _

From the second condition and forth condition, we can conclude that the girls are placed as per the following:

T S U _ _ _ R

Now the placing positions of P, Q and V are to be determined.

As per the third condition, if S and Q interchange their place then they will get exactly one new neighbor. That means their another one neighbor will be the same. So, the position of Q will be such that S and Q will share a common neighbor. So, we can conclude that, the placing arrangement of girls is like:

T S U Q _ _ R

As, more conditions are not given to satisfy the positions of P and V, there are two possible placing arrangements:

T S U Q P V R

and

T S U Q V P R

Best Wishes