How can one talk without saying a single word?

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?

You need to arrange three 7 and mathematical symbols to form number 1?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

In the image given, you can find several triangles. Can you count them all?

What seven-letter word has hundreds of letters in it?

A boy was driving a car, a girl took a lift from her. She asked his name. The boy said - my name is hidden in my car’s number, find it if you can. After this, she got down Car number was [ WV733N ] Can you guess the name now?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?