What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

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.'

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

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?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

You can hear me, but you can't touch or see me.

What am I?

What has one eye, but can’t see?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

What work can one never finish?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?