Which tank will fill first?

Solve the equation in the image by looking at the pattern closely.

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

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What is the end of everything?

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?

What is next number in the pattern below:

131 517 192 123 ?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

How many triangles can you count in the figure given?