If 80 is 80% of a value what is the value

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?