Brian read two books with 15 chapters, so he read 2*15=<<2*15=30>>30 chapters.
He also read a book with 20 chapters, bringing the total for the first three to 30+20=<<30+20=50>>50 chapters.
He then read a book with half the chapters of his cumulative total so far, so it had 50/2=<<50/2=25>>25 chapters
In total, he read 30+20+25=<<30+20+25=75>>75 chapters.
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