It appears there may be a typo in your question. If you are referring to a "dewy decimal system," it is a classification system used in libraries to organize books based on subject matter. It was developed by Melvil Dewey and assigns a unique number to each book to make it easier for users to find materials.
You would find the Dewy Classification System in a Library!
5% = 0.05
dewy decemal system
Melvil Dewy
He created the Dewy Decimal system
using the dewy decimal system.
Trains would be in the 620s.
Dewy's Adventure happened in 2007.
Yes, "dewy" is an adjective. It describes something that is covered with or resembles dew, often conveying a sense of freshness or moisture. For example, you might describe a dewy morning or dewy skin.
To convert 75% to decimal divide by 100: 75% ÷ 100 = 0.75
Dewy's Adventure was created on 2007-07-26.
Dewy works at the DIY store on Sludge Street.