Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

How many triangles can you find in this given picture?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

Prove that the below maths equation is true.

8 + 8 = 91

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

You see me once in June, twice in November, and not at all in May. What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?