Fraction question

[Master]

If 2/6 of all books at a library are nonfiction and 1/4 of the nonfiction books are biographies, then what fraction of the library’s books are nonfiction biographies?

 

[blamocur]

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[Steven G]

Have you heard of a mathematical operation known as subtraction.

 

[Dr.Peterson]

If 2/6 of all books at a library are nonfiction and 1/4 of the nonfiction books are biographies, then what fraction of the library’s books are nonfiction biographies?

Do you see that the answer is 1/4 of 2/6, since 2/6 of all books are nonfiction?

Please show your attempt at working this out.