Which tank will fill first?

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?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

What runs around the whole yard without moving?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Replace the question mark in the picture below.

Can you count the number of squares in the given picture?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?