18.93million is the answer. the population in 1980 was 5.93m and 24.86m in 2017
76.7%------------------------------
I believe the answer is: <span>tiered lessons
</span><span>tiered lessons refers to a study approach that is aimed to make student in the class to utilize various cognitive skills in order to tackle different problems.
This approach is used to make the class become more flexible and not forcing the children to stick into one specific way of learning.</span>
Chinese immigrants first flocked to the United States in the 1850s, eager to escape the economic chaos in China and to try their luck at the California gold rush. When the Gold Rush ended, Chinese Americans were considered cheap labor.