2, 3, 5, 9, 17, _ What is the next number in the sequence?

In the image given, you can find several triangles. Can you count them all?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

What question can you never answer yes to?

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?

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?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

I’m tall when I’m young, and I’m short when I’m old. What am I?