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?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

Using eight eights and addition only, can you make 1000?

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

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?