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At a certain fruit stand, the price of an apple is twice the

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At a certain fruit stand, the price of an apple is twice the [#permalink] New post 07 Nov 2018, 03:25
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At a certain fruit stand, the price of an apple is twice the price of an orange. For which of the following combinations of apples and oranges is the total price equal to the total price of 20 oranges?

Indicate all such combinations

A. 2 apples and 16 oranges

B. 3 apples and 14 oranges

C. 4 apples and 10 oranges

D. 6 apples and 8 oranges

E. 10 apples and 5 oranges

F. 12 apples and 4 oranges
[Reveal] Spoiler: OA

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Re: At a certain fruit stand, the price of an apple is twice the [#permalink] New post 08 Nov 2018, 03:19
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Carcass wrote:
At a certain fruit stand, the price of an apple is twice the price of an orange. For which of the following combinations of apples and oranges is the total price equal to the total price of 20 oranges?

Indicate all such combinations

A. 2 apples and 16 oranges

B. 3 apples and 14 oranges

C. 4 apples and 10 oranges

D. 6 apples and 8 oranges

E. 10 apples and 5 oranges

F. 12 apples and 4 oranges


Explanation:

A quick way is to insert values,

Let the price of 1 orange = $1 (Use numbers such that it is convenient to calculate)

therefore the price of the 1 Apple = $2

Price of 20 Orange = $20

With the above information let put them in the options:

A. 2 apples and 16 oranges = (2 *2) + (16 *1) = 4 + 16 = $20 = This is correct

B. 3 apples and 14 oranges = (3 * 2) + (14 * 1) = 6 + 14 = $20 = This is correct

C. 4 apples and 10 oranges = (4 * 2) + (10 * 1) = 8 + 18 = $18 = not possible

D. 6 apples and 8 oranges = (6 *2) + (8 * 1) = 12 + 8 = $20 = This is correct

E. 10 apples and 5 oranges = (10 * 2) + (5 * 1) = $25 = not possible

F. 12 apples and 4 oranges = (12 * 2) + (4 * 1) = $28 = not possible

Options are A,B and D
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Re: At a certain fruit stand, the price of an apple is twice the   [#permalink] 08 Nov 2018, 03:19
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At a certain fruit stand, the price of an apple is twice the

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