What is the centre of gravity?

Find the next number in the sequence

5 12 24 36 ?

How can you leave a room with two legs and return with six legs?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

How many triangles are there on the puzzle below?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

What is common among 11, 69, and 88?

What word is pronounced the same if you take away four of its five letters?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?