unuel', ), ); ?> Sarah made a phone call from New York to Memphis. : Data Sufficiency (DS)
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Sarah made a phone call from New York to Memphis.

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Sarah made a phone call from New York to Memphis.  [#permalink]

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New post 17 Apr 2018, 08:38
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82% (01:38) correct 18% (02:00) wrong based on 59 sessions

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Sarah made a phone call from New York to Memphis. After the first two minutes, the rate per minute dropped by 10 cents. If the call cost $3.60, how many minutes did the call last?

1) The rate for the first two minutes is 30 cents per minute.
2) If Sarah's call had been 8 minutes longer, it would have cost $5.20.

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Re: Sarah made a phone call from New York to Memphis.  [#permalink]

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New post 17 Apr 2018, 12:57
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1) Statement tell that for first two minutes the cost is 30 cents per min so actually it would have been 40 cents

2) this helps us knowing the price as follows : (x-10)*2 + xy
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Re: Sarah made a phone call from New York to Memphis.  [#permalink]

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New post 17 Apr 2018, 22:10
itisSheldon can you please explain or PM me how A and B are alone sufficient ?
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Re: Sarah made a phone call from New York to Memphis.  [#permalink]

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New post 18 Apr 2018, 01:44
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teaserbae wrote:
itisSheldon can you please explain or PM me how A and B are alone sufficient ?

Also responding to a PM
From question stem we know that: 2r + (T – 2)*(r – 10) = 360 (Note for Non-Americans: 1$= 100 cents)
Here we have 2 unknowns and 1 equation
Statement 1 gives the value of 'r', so we can solve the equation
Statement 2 gives us the following equation
2r+((T+8)-2)*(r - 10) = 520 (Since from Statement 2 wkt Sarah's call is 8 minutes longer than the previous call(T+8))
Here also we have 2 unknowns and 2 equations, so we get the answer comfortably.
Similar questions to practice
https://gmatclub.com/forum/the-cost-of- ... fl=similar
https://gmatclub.com/forum/the-cost-of- ... l=similar( In this thread see for Bunuel's post, he has attached a bunch of similar questions)
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Re: Sarah made a phone call from New York to Memphis. &nbs [#permalink] 18 Apr 2018, 01:44
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Sarah made a phone call from New York to Memphis.

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