Find the next number in the sequence

1, 2, 6, 21, 88, __?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

How is a fly different from a mosquito?

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

If your uncle’s sister is not your aunt, what relation is she to you?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

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

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?