Answer:

Step-by-step explanation:
Given
- 
Since both fractions have a common denominator, subtract the numerators leaving the denominator.
= 
= 
I'm not sure what the answer can be for this
The answer should be 390=60s, assuming s is the number of shelves he would need.
By the way, if you want the answer using this formula:
390=60s
390/60=s
6.5=s
s=6.5
(how many more needed) divided by (how many innings left)
17-6=11
4 left
11/4=2.75
needs to score 2.75 per inning (even though you can't score 0.75 point)