Alex gives his friends a total of 5 friends * 20 meters of silk = <<5*20=100>>100 meters of silk.

This means he has 600 – 100 = <<600-100=500>>500 meters of silk left in storage.

He can therefore make 500 meters of silk / 5 meters of silk per dress = <<500/5=100>>100 dresses.

# Answer

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Alex makes luxury dresses out of silk. Each dress needs 5 meters of silk and Alex has 600 meters of silk in storage. His friends also want to learn how to make these dresses so Alex gives all 5 of them 20 meters of silk each. He uses the rest to make dresses himself. How many dresses can Alex make?
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100
Alex makes luxury dresses out of silk. Each dress needs 5 meters of silk and Alex has 600 meters of silk in storage. His friends also want to learn how to make these dresses so Alex gives all 5 of them 20 meters of silk each. He uses the rest to make dresses himself. How many dresses can Alex make?
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