What begins with T, ends with T, and has T in it?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

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.'

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Can you write down eight eights so that they add up to one thousand?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?