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 does the below rebus riddle means?

The more you take me, the more you leave me behind.
Who Am I?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

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

which number am I?

How many triangles can you find in this given picture?

John needs to purchase 100 chocolates from three different shops and he has exactly 100 rupees to do that which he must spend entirely. He must buy at least 1 Chocolate from each shop.

The first shop is selling each chocolate at 5 paise, the second is selling at 1 rupee and the third is selling at 5 rupees.

How many chocolates should he buy from each shop?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

You need to move three matchsticks to form three squares. Can you do it?

Can you count the number of triangles in the given figure?