What number should come in place of the question mark below?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Why do Chinese men eat more rice than Japanese men do ?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Why is the longest human nose just 11 inches?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?