What number when divided in half becomes zero?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

What's a single-digit number with no value?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Count the number of triangles in the given picture.

I am sure no one can have two things for dinner. what are they?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

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?

How many times in a given day, minutes and hour clock comes in a straight line ?

What number divided by 4 is the same as that number minus 4?