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Manager
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The toll for crossing a certain bridge is $0.75 each [#permalink] ### Show Tags 09 Oct 2008, 05:00 This topic is locked. If you want to discuss this question please re-post it in the respective forum. The toll for crossing a certain bridge is$0.75 each crossing. Drivers who frequently use the 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 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
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10 Oct 2008, 01:43
Not sure whether I understood the question properly.

For x days, if the driver uses sticker and if x <=21 then driver will pay $13. But, without sticker, the driver will be 0.75*2*x = 1.5x In order for the driver to save money, 1.5x > 13 or x > 13/1.5 or x > 8 and the very first answer choice should be the correct answer. Manager Joined: 10 Aug 2008 Posts: 76 Followers: 1 Kudos [?]: 13 [0], given: 0 Re: math---cross the bridge [#permalink] ### Show Tags 10 Oct 2008, 02:12 lets take it takes x days for better savings. Than and each day he crosses twice the bridge So 0.75(2x) = 13 + 0.3(2x) => x = 14.44 days So least number of days is 15 Answer is B) Intern Joined: 01 Nov 2005 Posts: 48 Location: New jersey Followers: 1 Kudos [?]: 2 [0], given: 0 Re: math---cross the bridge [#permalink] ### Show Tags 10 Oct 2008, 02:16 I agree with Amit on the solution. What is correct answer btw ? _________________ Target +700 Life is like a box of chocolate, you never know what you gonna get.. SVP Joined: 17 Jun 2008 Posts: 1569 Followers: 11 Kudos [?]: 250 [0], given: 0 Re: math---cross the bridge [#permalink] ### Show Tags 10 Oct 2008, 03:22 AmitGUPTA wrote: lets take it takes x days for better savings. Than and each day he crosses twice the bridge So 0.75(2x) = 13 + 0.3(2x) => x = 14.44 days So least number of days is 15 Answer is B) You are right. I missted "then" keyword after "$13" in the question.
Re: math---cross the bridge   [#permalink] 10 Oct 2008, 03:22
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