Animal species

Of 100 types of animals, 9/100 were discovered in ancient times, and 2/100 were found in the Middle Ages. Another 3/10 were found in the 1800 s. What fraction of the 100 types of animals were discovered after the 1800 s? Explain.

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You need to know the following knowledge to solve this word math problem:

arithmetic

subtraction

numbers

fractions

Grade of the word problem

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