Can you pass this 1970s quiz?
In 1978, Louise Brown became the first child to . . .
Vote at the age of 18
Survive poliomyelitis
Get a Nobel prize
Be born via in vitro fertilisation
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Erin reads an average of 20 books per year. She read 23, 17, 20, and 19 books in four different years. How many books did Erin read in the 5th year to make it an average of exactly 20.0 per year?