Answer :
Let the first term of both the terms be
and last term be 
Now, by using the mid point formula to find the mid point of the segment -

Now, by substituting the values of both x and y -

Adding -7 and 6 -

Now, move the negative in front of the fraction -

Answer:
the answer is the 3rd one
Answer: 14 / 20 = 70%
Step-by-step explanation:
I think isn't anyone of these alternatives because if we put number 15 in the place of y it is x-y=30. X-15=30
X=30+15=45.
X=45