Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

By adding four matchsticks, can you divide the square shown in the picture into two equal parts?

What jumps when it walks and sits when it stands?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?