A school library has 120 books.  Each student needs 5 books for their classes.  The library was able to help 4 students on the first day of school, 5 students on the second day and 6 students on the third day.  How many students can the library help out on the fourth day of school?
On the first day, the library used 4 students * 5 books = <<4*5=20>>20 books.
On the second day, the library used 5 students * 5 books = <<5*5=25>>25 books.
On the third day, the library used 6 students * 5 books = <<6*5=30>>30 books.
On the fourth day, the library had 120 books - 20 - 25 - 30 = <<120-20-25-30=45>>45 books remaining.
The library can help 45 books / 5 books = <<45/5=9>>9 students on the fourth day.
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Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
You are solving math problems. Here are some examples of how to solve the task:

Bob has a cube of silver that measures 3 inches on each side.  A cubic inch of silver weighs 6 ounces.  Each ounce of silver sells for $25.  He sells it for 110% of its silver value.  How much does he sell it for?The silver has a volume of 3*3*3=<<3*3*3=27>>27 cubic inches
So it weighs 27*6=<<27*6=162>>162 ounces
So its value is 162*25=$<<162*25=4050>>4050
That means he sold it for 4050*1.1=$<<4050*1.1=4455>>4455
#### 4455[END]

Agatha has $60 to spend on a new bike. She spends $15 on the frame, and $25 on the front wheel. What does she have left, in dollars, to spend on a seat and handlebar tape?Agatha spends 15+25=<<15+25=40>>40 dollars.
Agatha has 60-40=<<60-40=20>>20 dollars left.
#### 20[END]

Now, solve this next question in the style of the above examples:

A school library has 120 books.  Each student needs 5 books for their classes.  The library was able to help 4 students on the first day of school, 5 students on the second day and 6 students on the third day.  How many students can the library help out on the fourth day of school?

### Response:
On the first day, the library used 4 students * 5 books = <<4*5=20>>20 books.
On the second day, the library used 5 students * 5 books = <<5*5=25>>25 books.
On the third day, the library used 6 students * 5 books = <<6*5=30>>30 books.
On the fourth day, the library had 120 books - 20 - 25 - 30 = <<120-20-25-30=45>>45 books remaining.
The library can help 45 books / 5 books = <<45/5=9>>9 students on the fourth day.
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