...... 42, according to the supercomputer Deep Thought in Douglas Adams' novel 'The Hitchhiker's Guide'.
It certainly is the answer in the following examples :-
1) How many days are there in 6 weeks?
2) What is 3 stone in pounds?
3) How many days does it take for a 1 Watt load to use 1 unit of mains electricity?

Any other examples?

 

When your cold beer is too warm.

 

...... 42, according to the supercomputer Deep Thought in Douglas Adams' novel 'The Hitchhiker's Guide'.
It certainly is the answer in the following examples :-
1) How many days are there in 6 weeks?
2) What is 3 stone in pounds?
3) How many days does it take for a 1 Watt load to use 1 unit of mains electricity?

Any other examples?

What is "1 unit of mains electricity"?

I don't consider either 41.67 days or to be the same as 42.

But then I don't consider 42 days or 42 lb to be the same as 42 (a pure number).

 

What do you get when you multiply six times seven?

 

42 is the answer to an infinite number of questions.

But is the number of questions to which 42 is the answer countable, or uncountable?

My suspicion is that it is uncountable. But even if it is, it is still far from universal.

 

"We apologize for the inconvenience."

 

"What do you get when you multiply six by nine"
https://en.wikipedia.org/wiki/42_(number)

 

What is "1 unit of mains electricity"?

1kWh

 

1kWh

Says who?
The unit of mains electricity seems to be a term from India. 1 unit of Electricity is a totally non-technical term.

https://en.wikipedia.org/wiki/Electricity

 

The only association I have with a kWh is as a billing unit.

 

Yes, it's a billing unit, in the UK at least.

 

The only association I have with a kWh is as a billing unit.

It's a unit of energy equal to 3.6 MJ. Since homes typically consume between (very roughly) 500 to 1000 kWh of electrical energy a month, it makes for a convenient billing unit.