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If Juan had a doctor's appointment on a certain day, was the appointment on a Wednesday?

1) Exactly 60 hours before the appointment, it was Monday. 2) The appointment was between 1:00 pm and 9:00 pm.

Thanks! Please let me know if it is on Wednesday what time it would occur.

i think the answer is C

1) tells us prior to appt, 60 hrs = 2.5 days -> it was Monday
picking arbitrary times
Monday @ 12am = appt was on Wednesday @ noon
Monday @ 10pm = appt happened on Thursday @ 10am
not sufficient

2) appt was between 1pm and 9pm
only tells us the block of time appt occurred and not the day
not sufficient

Statement 1 doesn't tell us anything concrete by saying 60 hours prior it was Monday.

If the appointment was 5:00PM Wednesday afternoon than 60 hours prior would be 5:00AM Monday morning which would be A-OK.

However, if the appointment was 12:00AM Thursday morning than 60 hours prior would be 12:00PM Monday afternoon. In fact, 60 hours prior just shows that the appointment has to be between 12:00PM Wednesday and 12:00PM Thursday.

the second statement saying it was between 1 and 9 PM doesn't mean anythign on it's own, but given our 12-12 constraint from the first statement it proves the appt is in fact on Wednseday.

but he does not have an appointment on Wed It's on Thurs.

1pm + 24 = Tues + 24 = Wed + 12 = 1am Thurs.

9pm is even later on Thursday.

You're counting up from 1p.m. on Monday - you should be counting back from 1p.m. on Wednesday, since the appt was not on Monday. The 1 - 9 p.m. time span was for the day of the appt. Counting back from 1 p.m. on Wednesday takes you to 1 a.m. on Monday.

If Juan had a doctor's appointment on a certain day, was the appointment on a Wednesday?

1) Exactly 60 hours before the appointment, it was Monday. 2) The appointment was between 1:00 pm and 9:00 pm.

Thanks! Please let me know if it is on Wednesday what time it would occur.

Is there a methodical way to solve this problem? Picking arbitary numbers is a pain and waste of time ... I would appreciate it if someone has some method to solve this problem ....

Is there a methodical way to solve this problem? Picking arbitary numbers is a pain and waste of time ... I would appreciate it if someone has some method to solve this problem ....

It's not arbitary... it's perfectly logical. 60 hrs-2.5 days before the appointment. If the appointment is during the specified time period of that day only then can one confirm the day of the appointment.

but he does not have an appointment on Wed It's on Thurs.

1pm + 24 = Tues + 24 = Wed + 12 = 1am Thurs.

9pm is even later on Thursday.

You're counting up from 1p.m. on Monday - you should be counting back from 1p.m. on Wednesday, since the appt was not on Monday. The 1 - 9 p.m. time span was for the day of the appt. Counting back from 1 p.m. on Wednesday takes you to 1 a.m. on Monday.

why should we count back from 1PM on Wednesday? I agree with 'StartupAddict'. Even I got Thursday.

Re: If Juan had a doctor's appointment on a certain day, was the [#permalink]
10 Dec 2011, 06:39

Together: Taking the extreme range: Say the appointment is on 1PM Wednesday. 48 hrs ago it was Monday 1 PM. 60 hrs ago it was Monday 1 PM -12 hrs= Monday 1 AM Say the appointment is on 9PM Wednesday. 48 hrs ago it was Monday 9 PM. 60 hrs ago it was Monday 9 PM -12 hrs= Monday 9 AM The appointment has to be on Wednesday.

Re: If Juan had a doctor's appointment on a certain day, was the [#permalink]
03 Feb 2014, 00:25

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Re: If Juan had a doctor's appointment on a certain day, was the [#permalink]
03 Feb 2014, 04:15

Expert's post

If Juan had a doctor's appointment on a certain day, was the appointment on a Wednesday?

(1) Exactly 60 hours before the appointment, it was Monday --> 60 hours = 2.5 days. Now, check some extreme cases: if 2.5 days before the appointment it was 1:00 o'clock on Monday then after 2.5 days it would be 13:00 on Wednesday but if 2.5 days before the appointment it was 13:00 o'clock on Monday then after 2.5 days it would be 1:00 on Thursday. Not sufficient.

(2) The appointment was between 1:00 pm and 9:00 pm. Clearly insufficient.

(1)+(2) The appointment could not have been on Thursday, because 2.5 days prior any time from 1:00 pm and 9:00 pm on Thursday is not Monday. So, the appointment was on Wednesday. Sufficient.

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