Sam, Mathew and Kelvin each read 1\5 th part of the class library books, o Sam read 20 books, find out the number of books in the library.
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Let the number of books in the library be x .
Sam , Mathew and Kelvin each read
= 1/5 th part of the library books.
= x/5 books .
Sam read = 20 books .
{i.e. x/5 part of library books .}
→ x/5 = 20
→ x = 20 × 5
→ x = 100 books
Hence the number of books is 100 .
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