2 and a half dozen donuts is equal to 2.5 x 12 = 30 donuts.
If Chris eats 10% of the donuts, he eats 10/100 x 30 = 3 donuts.
After eating 3 donuts, Chris has 30 - 3 = 27 donuts left.
If Chris grabs another 4 donuts for his afternoon snack, he now has 27 - 4 = 23 donuts left for his co-workers.
#### 23
The answer is: 23
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Chris buys 2 and a half dozen donuts on his way to work to share with his co-workers.  While driving, he eats 10% of the donuts.  Once inside, he grabs another 4 donuts for his afternoon snack.  How many donuts are left for his co-workers?

### Answer:
