In a certain code language 'this is rose garden' means '$Z@3', 'garden has many flowers' means '74@1' and 'flowers are very colorful' means '81%2'. Then '@ 1' is the code for which words?
'garden' is common to items 1 and 2. So 'garden' = '@'. Next we can see that 'flowers' is common to items 2 and 3. So 'flowers' = '1'. Hence '@ 1' should be 'garden flowers' or 'flowers garden'