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.'

When can we add 2 to 11 and get 1 as the correct answer?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

How can one talk without saying a single word?

Solve the counting riddle by identifying the number of triangles in the given picture.

If 1+9+8=1, what is 2+8+9?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

What has 88 keys?