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The toll for crossing a certain bridge is $0.75 each [#permalink]
02 May 2006, 02:11
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?
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!