- The total population for the 5 endangered penguin species is 828,770. The northern rockhopper penguin
makes up 64% of that population. What is the estimated
population of the northern rockhopper penguin?

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.