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Tom has 8 history books, 6 math books, 5 black pens and 4 blue pencils.

(a) The ratio of  history books to math books:

/

(b) The ratio of black pens to blue pencils:

to

(c) The ratio of books to the pens:

: .

(d) The ratio of pens and pencils to the books:

to .

Correct!