How many days in a week?

Logic Level 2

On a strange planet:

Yesterday's tomorrow's yesterday has the same name as tomorrow's yesterday's tomorrow.

How many days are there in each week on this strange planet?

Note: the planet has an integer number of days > 1


The answer is 2.

Stephen Mellor by Stephen Mellor , 20, United Kingdom

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1 solution

Aman Thegreat
Oct 15, 2017

Let Day 1 1 represent today, Day 2 2 represent yesterday, Day 3 3 represent tomorrow.

First statement implies the day is yesterday's , that is it is Day 2 2

Second statement implies the day is tomorrow's, that is it is Day 3 3

Now according to the question, first statement and second statement are equal.

That is Day 2 2 = = Day 3 3

Or Yesterday = = Tomorrow

Clearly such a week can have only two days.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Or, you could use the fact that Yesterday's Tomorrow and Tomorrow's Yesterday both mean Today. Allowing you to rephrase the problem as Yesterday = Tomorrow

Stephen Mellor - 3 years, 7 months ago

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