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

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Math Expert
Joined: 02 Sep 2009
Posts: 58430
At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and  [#permalink]

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11 Dec 2015, 09:10
2
00:00

Difficulty:

15% (low)

Question Stats:

91% (01:01) correct 9% (01:04) wrong based on 63 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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11 Dec 2015, 10:15
3D + C = 2.25......(1)
2D + C = 1.7........(2)
(1) - (2) --> D = 0.55 --> 2D = 1.1

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

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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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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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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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