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The toll for crossing a certain bridge is $0.75 each

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Manager
Manager
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Joined: 17 Jan 2006
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The toll for crossing a certain bridge is $0.75 each [#permalink] New post 02 May 2006, 02:11
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 2 sessions
The toll for crossing a certain bridge is $0.75 each crossing. Drivers who frequently usethe bridge may instead purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month. If a particular driver will cross the bridge twice on each 10 of x days next month and will not cross the bridge on any other day, what is the least
value of x for which this driver can save money by using the sticker?
A. 14
B. 15
C. 16
D. 28
E. 29
Director
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 [#permalink] New post 02 May 2006, 17:06
Answer is B - 15

Wasn't clear what is meant by "twice on each 10 of x days next month"
I am assuming the driver is crossing the bridge twice for x days in the month (maybe a typo and should be twice on each 1 of x days next month).

By trial and error, start plugging in 16 (because thats the median) for x, then 15, then 14. 15 works!

0.75 * 2 * X compared to 13 + (0.3 * 2 * X)

What have you got?
VP
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 [#permalink] New post 03 May 2006, 01:41
I am getting 15


0.65*2*x>13 + 0.3*2*x

Solving for x > 14.xx

which is 15 DAYS.
Intern
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 [#permalink] New post 04 May 2006, 02:03
hi dinesh8

please clear the statement "twice on each 10 of x days "


i will go for the B
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go,get it........

  [#permalink] 04 May 2006, 02:03
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The toll for crossing a certain bridge is $0.75 each

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