Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Can you move 2 matchsticks to form four equal sized squares.

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

What is the fastest way to double your money?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?