If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

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?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?

Can you solve below mathematical equation?

2^1234 - 2^1233

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Find the next number in the series.
1 10 24 43 67 ?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?