Source: Princeton Review
If the total price for n copies of a book is $31.5, what is the price per copy of the book?
1) If twice as many copies were bought for the same total price, the price per copy would be $1.75.
2) If 4 fewer copies were bought for the same total price, the price per copy would be $2.80 greater.
The OA is D
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If the total price for n copies of a book is $31.5, what is the price per copy of the book?
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BTGmoderatorLU
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Jay@ManhattanReview
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Let's take each statement one by one.BTGmoderatorLU wrote: ↑Tue Mar 31, 2020 2:05 amSource: Princeton Review
If the total price for n copies of a book is $31.5, what is the price per copy of the book?
1) If twice as many copies were bought for the same total price, the price per copy would be $1.75.
2) If 4 fewer copies were bought for the same total price, the price per copy would be $2.80 greater.
The OA is D
1) If twice as many copies were bought for the same total price, the price per copy would be $1.75.
=> the price per copy of the book = 2*1.75 = $3.50. Sufficient
2) If 4 fewer copies were bought for the same total price, the price per copy would be $2.80 greater.
=> 31.50/n = 31.50/(n – 4) – 2.80
We can get the unique value of n. Sufficient.
The correct answer: D
Hope this helps!
-Jay
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