Answer :

Empty tins and bottles should have been thrown to the blue dustbin since they are recyclable, if dustbins were not available they would have taken it to home and when such 10 items were collected they must be given by their parents at recycle store.

Crumbs of food might have been given to animals like dog or cow.

Paper plates and napkins are decomposable so they must have been thrown in green dustbins.

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