The cost of 4 pens 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
E. None of these
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সঠিক উত্তরঃ
A.
9/4
Explanation:
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