Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What is wrong in the below Picture?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?