If 20a+300=b what is the value of a+15

You have a poultry farm and a poultry-processing unit. which product can you make using the waste products from your processing unit?

Give 2 examples of the sedimentation in the deep ocean?

Trey has answered 15 e-mails. this is 20% of e-mails he must answer. how many e-mails does he need to answer? pls ; op'; ; p'[o; pio; uiylutryte