Replace the question mark with the number below given a simple math problem.

Can you place three balls such that the equation shown in the picture holds true?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

What happened when the wheel was invented?

Below rebus represent famous DiCaprio movie. Can you name it?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

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