Write and solve an equation of ratios:
15 x
----- = --------
17 $51
Then 15($51) = 17x, or x = $45 (answer)
The cost of book at BookWorm is Option (B) 45 .
Given that the ratio of the price at BookWorm to the price at Reading Nook was 15 : 17 .
Also given that the book cost $51 at Reading Nook .
The price of the book at BookWorm is -
= 15/17 * $51
= $45
Thus, the cost of book at BookWorm is Option (B) 45 .
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