What equals 90?

Answer 1

There are infinitely many possible answers.

Start with the sum of two integers:

45+45, 44+46, 43+47, ... , 1+89, 0+90, -1+91, -2+92, ...

then add in 1 decimal places:

44.9+45.1, 44.8+45.2, etc

then 2 decimal places

etc.

Then add in irrationals:

45-sqrt(2) and 45+sqrt(2), 44-sqrt(2) and 46+sqrt(2),

and again, 1 decimal place, 2 , 3, ... decimal places.

Then try multiplications

1*90, 2*45, 3*30, 4*22.5, 5*18 etc

and then add decimal places here.

And so far we have dealt with pairs. Move on to triplets and foursomes and so on.

I hope that by this stage (if not sooner), you have recognised the futillity of hoping for a straight answer to a question that does not have a straight answer!

Answer 2

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Answer 3

2