Ericka and her friend are going to reshelf library books. sherri will reshelf 50% and ericka will reshelf 2/5 of the books. if there are 80 books to reshelf, how many will be left?

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?