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Q 8. At a certain food stand, the price of each apple is [#permalink]

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10 Oct 2005, 11:45

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Q 8.
At a certain food stand, the price of each apple is Â¢ 40 and the price of each orange is Â¢60. Mary selects a total of 10 apples and oranges from the food stand, and the average (arithmetic mean) price of the 10 pieces of fruit is Â¢ 56. How many oranges must Mary put back so that the average price of the pieces of fruit that she keeps is Â¢ 52?
A. 1
B. 2
C. 3
D. 4
E. 5
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to get average 56, y = 56 (pls refer to chets post)

Hence 8 - 6 = 2.

when she returns oranges, x+y will no longer be equal to 10.

x will remain 2, and y will be the new number of oranges.

If she returns 5 oranges, she will have 3 oranges and 2 apples. To check accuracy, you can cross check by checking the average price of 3 oranges and 2 apples, which should equal 52 cents.

The equation is 40X +60 (10-X)=560; whihc gives value of x=2;y=8
Now substituting, 520 instead of 560, we get x=4 adn y= 6, therefore to reduce the avearge she will have to put back 2 oranges. Therefore B ?

You cannot substitute 560 by 520 as you dont know the total number of items. The changed total number of items will be less than 10 - so the sum is 52(2+y)

Re: Q 8. At a certain food stand, the price of each apple is [#permalink]

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15 May 2016, 09:19

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Re: Q 8. At a certain food stand, the price of each apple is [#permalink]

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11 Sep 2017, 12:46

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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