296 books= 100% readed
Parker reads = 100% - 50% - 37% = 13% of books
Now find which number of books Parker read
296 = 100%
Find 13% of 296
Then cross multiply
296x 13= 100x 1
Parker read 296x13/100= 38.5 books
(For a proof , find 10% = 29.6, 2
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