If Alex gives each of his 5 friends 20 meters of silk, he will give away a total of 5 friends x 20 meters = 100 meters of silk.
If Alex has a total of 600 meters of silk and he gives away 100 meters, he will have 600 meters - 100 meters = 500 meters of silk remaining.
If each luxury dress requires 5 meters of silk, Alex can make 500 meters / 5 meters = 100 dresses using the remaining silk.
#### 100
The answer is: 100
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If each luxury dress that Alex makes requires 5 meters of silk and he has a total of 600 meters of silk in storage, and he gives each of his 5 friends 20 meters of silk each, how many dresses can Alex make using the remaining silk?

### Answer:
