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At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and

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At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and [#permalink]

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New post 11 Dec 2015, 09:10
2
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

87% (00:44) correct 13% (00:18) wrong based on 52 sessions

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At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and was charged $ 2.25. Stella ordered 2 doughnuts and a cup of coffee and was charged $ 1.70. What is the price of 2 doughnuts?

A. $ 0.55
B. $ 1.00
C. $ 1.10
D. $ 1.30
E. $ 1.80

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Re: At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and [#permalink]

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New post 11 Dec 2015, 10:15
3D + C = 2.25......(1)
2D + C = 1.7........(2)
(1) - (2) --> D = 0.55 --> 2D = 1.1

Answer: C
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Re: At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and [#permalink]

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New post 11 Dec 2015, 12:10
Joe ordered 3 Dougnuts and Cup of Coffee. Stella ordered 2 Doughnuts and cup of coffee which means Joe ordered 1 doughnut more than stella only. So 1 doughnut must be 2.25 - 1.7 = 0.55
Price of 1 Doughnut = 0.55
Price of 2 Doughnut = 0.55*2 = 1.1 = C
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At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and [#permalink]

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New post 12 Dec 2015, 14:43
3d+c=2.25
-(2d+c=1.70)
d=.55

2d=1.10


C. $ 1.10
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Re: At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and [#permalink]

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New post 02 Jan 2018, 09:41
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Re: At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and   [#permalink] 02 Jan 2018, 09:41
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