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 1800s. What fraction of the 100 types of animals were discovered after the 1800s? Explain.

Correct answer:

x =  59/100

Step-by-step explanation:

a=1009=0.09 b=1002=501=0.02 c=103=0.3  x=1abc=11009501103=10059=0.59

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