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Metro City street cleaning occurs according to the following schedule: 19 Feb 2024, 23:06
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X: Central Street Y: First Street
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

55% (hard)

Question Stats:

65% (02:09) correct 35% (02:19) wrong based on 1281 sessions

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­Metro City street cleaning occurs according to the following schedule:

• First Street: every Thursday

• Second Street: every fourth Tuesday

• Third Street: every Monday

• Central Street: every third Wednesday

• Grand Street: every fourth Saturday

• Main Street: every second Friday

Select for X and for Y two streets such that every cleaning of the street chosen for X must be followed on the next day by a cleaning of the street chosen for Y, consistent with the given information. Make only two selections, one in each column.­

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X Y
First Street
Second Street
Third Street
Central Street
Grand Street
Main Street
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X: Central Street Y: First Street
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Metro City street cleaning occurs according to the following schedule: 21 Feb 2024, 00:32
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chetan2u
every cleaning of the street chosen for X must be followed on the next day by a cleaning of the street chosen for Y,

This means we take a street which is less often cleaned as X and more frequently cleaned as Y.

So Y should be checked for the ones cleaned every week. Every Monday and every Thursday.
Look for X as some street that is cleaned on a day prior that is Sunday or Wednesday. We have Central street being cleaned every third Wednesday.

Thus the two options that fit in are
X: Central street - every third Wednesday
Y: First street - every Thursday
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­Hi chetan2u
Consider the situation, every second friday main street cleaning happens which is followed by the cleaning in first street in thursday. Hence, X can be main street and Y can be first street.
What is wrong here ?
Thanks
Anish­
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Metro City street cleaning occurs according to the following schedule: 21 Feb 2024, 00:57
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anish777

chetan2u
every cleaning of the street chosen for X must be followed on the next day by a cleaning of the street chosen for Y,

This means we take a street which is less often cleaned as X and more frequently cleaned as Y.

So Y should be checked for the ones cleaned every week. Every Monday and every Thursday.
Look for X as some street that is cleaned on a day prior that is Sunday or Wednesday. We have Central street being cleaned every third Wednesday.

Thus the two options that fit in are
X: Central street - every third Wednesday
Y: First street - every Thursday
­Hi chetan2u
Consider the situation, every second friday main street cleaning happens which is followed by the cleaning in first street in thursday. Hence, X can be main street and Y can be first street.
What is wrong here ?
Thanks
Anish­
Show more
­Hi Anish

Every cleaning on a given day in X should be followed by cleaning on next day on Y.
If you take X as the main street. X gets cleaned every second Friday, so Y should get cleaned at least on every second Saturday. But first street gets cleaned on every Thursday.

Thus, in your example, Y happens first and X happens on the next day. Actually, it has to be the other way.
 
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DrAnkita91
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Metro City street cleaning occurs according to the following schedule: 17 Mar 2024, 19:57
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chetan2u
every cleaning of the street chosen for X must be followed on the next day by a cleaning of the street chosen for Y,

This means we take a street which is less often cleaned as X and more frequently cleaned as Y.

So Y should be checked for the ones cleaned every week. Every Monday and every Thursday.
Look for X as some street that is cleaned on a day prior that is Sunday or Wednesday. We have Central street being cleaned every third Wednesday.

Thus the two options that fit in are
X: Central street - every third Wednesday
Y: First street - every Thursday
Show more
­
how did we come to this?? whats the logic? please can you explain
"This means we take a street which is less often cleaned as X and more frequently cleaned as Y"
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Metro City street cleaning occurs according to the following schedule: 05 Oct 2024, 15:14
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the question wants a day (x) where we will have a consequent day (y) that will be cleaned. so if X is cleaned, then Y is cleaned the day after. I tried using options for X an pair them with Y. For example: if X is is • First Street: every Thursday, then we need a Y that is cleaned every Friday, and there is no such street cleaned every Friday, so X could not be First Street, then X: Second Street: every fourth Tuesday, then we will need a Y that is cleaned every Wednesday, and there is no such Y for example if x is Second Street and Y is Central Street: every third Wednesday, they could coincide or not, so X could not be Second street.But if X is Central Street: every third Wednesday, we will have a Y that will ALWAYS be cleaned after X, y will be First Street: every Thursday. we don not. care if X is all Wednesdays cleaned, we only care that if X is cleaned, as it says even 3 Wednesdays, we for sure will have the next day Y First Street: every Thursday cleaned. for example

monday:
Tuesday
Wednesday: X Central Street: every third Wednesday
Thursday: Y First Street: every Thursday
friday
Saturday

monday:
Tuesday
Wednesday: here there will no be cleaning since it is every 3 Wednesday
Thursday: Y First Street: every Thursday
friday
Saturday

monday:
Tuesday
Wednesday: here there will no be cleaning since it is every 3 Wednesday
Thursday: Y First Street: every Thursday
friday
Saturday

NOW THE SEQUENCE REPETS AGAIN

monday:
Tuesday
Wednesday: X Central Street: every third Wednesday
Thursday: Y First Street: every Thursday
friday
Saturday

anish777
chetan2u
every cleaning of the street chosen for X must be followed on the next day by a cleaning of the street chosen for Y,

This means we take a street which is less often cleaned as X and more frequently cleaned as Y.

So Y should be checked for the ones cleaned every week. Every Monday and every Thursday.
Look for X as some street that is cleaned on a day prior that is Sunday or Wednesday. We have Central street being cleaned every third Wednesday.

Thus the two options that fit in are
X: Central street - every third Wednesday
Y: First street - every Thursday
­Hi chetan2u
Consider the situation, every second friday main street cleaning happens which is followed by the cleaning in first street in thursday. Hence, X can be main street and Y can be first street.
What is wrong here ?
Thanks
Anish­
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chetan2u
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Metro City street cleaning occurs according to the following schedule: 06 Oct 2024, 02:17
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A quick way would be logical way to tackle it but the solution in the video would surely be a safer way to get to the answer.

Logical way: every cleaning of the street chosen for X must be followed on the next day by a cleaning of the street chosen for Y,

This means we take a street which is less often cleaned as X and more frequently cleaned as Y.

So Y should be checked for the ones cleaned every week. Every Monday and every Thursday.
Look for X as some street that is cleaned on a day prior that is Sunday or Wednesday. We have Central street being cleaned every third Wednesday.

Thus the two options that fit in are
X: Central street - every third Wednesday
Y: First street - every Thursday

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Metro City street cleaning occurs according to the following schedule: 14 Jan 2025, 07:19
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Even though I got this question wrong in the mock, it's actually quite simple.

The question basically asks: "Which street will ALWAYS be cleaned the next day if you choose street X first?"

There is only 1 solution: every time you choose Central street, always the next day First street has to be cleaned.
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