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.'

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What runs around the whole yard without moving?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

When 99 is considered higher than 100?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

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

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

Identify Me

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

What do you see in the given picture?