The cost of 4pens is equal to the cost of 6 pencils.The cost of a CD is equal to the cost of 4 pencils and the cost of a book is e

The cost of 4pens is equal to the cost of 6 pencils.The cost of a CD is equal to the cost of 4 pencils and the cost of a book is equal to the cost of 6 pens.What is the ratio of the cost of a book to the cost of a CD A) 9/4 B)4/9 C)2/3 D)3/2​

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