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# At a certain food stand, the price of each apple is 40 and

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Manager
Joined: 10 Oct 2008
Posts: 56
At a certain food stand, the price of each apple is 40 and [#permalink]

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05 Nov 2008, 16:27
At a certain food stand, the price of each apple is ¢ 40 and the price of each orange is ¢ 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 ¢ 56. How many oranges must Mary put back so that the average price of the pieces of fruit that she keeps is ¢ 52?

A. 1
B. 2
C. 3
D. 4
E. 5

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Current Student
Joined: 28 Dec 2004
Posts: 3292
Location: New York City
Schools: Wharton'11 HBS'12
Re: apple and orange (30) [#permalink]

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05 Nov 2008, 16:59
40x+60y=56(10)

40x=560-60y

40x+60(y-w)=52(10-w)

560-60y+60y-60w=520-52w

40=8w
w=5

E it is

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Re: apple and orange (30)   [#permalink] 05 Nov 2008, 16:59
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# At a certain food stand, the price of each apple is 40 and

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